Error: Unable to emit response; headers already sent

Notice (8): Trying to get property of non-object [APP/Controller/AppController.php, line 97]

        if(!empty($dashboardtitle)) { 
            $dashData = $this->CydCommon->getDashboardIdByName($dashboardtitle, $preventAccess);
            $this->set('dashDataFile', (DASHBOARD_DATA_FILE_DIR."/". $dashData->_id ."_".DASHBOARD_DATA_FILE_NAME."_". $dashData->dashboardversion .".js"));

$event = object(Cake\Event\Event) {
	data => null
	result => null
	[protected] _name => 'Controller.initialize'
	[protected] _subject => object(App\Controller\PublishController) {}
	[protected] _stopped => false
}
$session = object(Cake\Network\Session) {
	[protected] _engine => null
	[protected] _started => null
	[protected] _lifetime => '86400'
	[protected] _isCLI => false
}
$MDashboardObj = object(Cake\ORM\Table) {

	'registryAlias' => 'MDashboards',
	'table' => 'm_dashboards',
	'alias' => 'MDashboards',
	'entityClass' => '\Cake\ORM\Entity',
	'associations' => [],
	'behaviors' => [],
	'defaultConnection' => 'default',
	'connectionName' => 'default'

}
$isLoggedin = false
$dashid = ''
$preventAccess = 'Yes'
$dashboardtitle = 'dashboard'
$dashData = ''

App\Controller\AppController::beforeFilter() - APP/Controller/AppController.php, line 97
App\Controller\PublishController::beforeFilter() - APP/Controller/PublishController.php, line 26
Cake\Event\EventManager::_callListener() - CORE/src/Event/EventManager.php, line 421
Cake\Event\EventManager::dispatch() - CORE/src/Event/EventManager.php, line 386
Cake\Controller\Controller::dispatchEvent() - CORE/src/Event/EventDispatcherTrait.php, line 78
Cake\Controller\Controller::startupProcess() - CORE/src/Controller/Controller.php, line 497
Cake\Http\ActionDispatcher::_invoke() - CORE/src/Http/ActionDispatcher.php, line 120
Cake\Http\ActionDispatcher::dispatch() - CORE/src/Http/ActionDispatcher.php, line 99
Cake\Http\BaseApplication::__invoke() - CORE/src/Http/BaseApplication.php, line 82
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Routing\Middleware\RoutingMiddleware::__invoke() - CORE/src/Routing/Middleware/RoutingMiddleware.php, line 52
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Routing\Middleware\AssetMiddleware::__invoke() - CORE/src/Routing/Middleware/AssetMiddleware.php, line 88
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Error\Middleware\ErrorHandlerMiddleware::__invoke() - CORE/src/Error/Middleware/ErrorHandlerMiddleware.php, line 51
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Http\Runner::run() - CORE/src/Http/Runner.php, line 51

Notice (8): Trying to get property of non-object [APP/Controller/AppController.php, line 97]

Code Context

        if(!empty($dashboardtitle)) { 
            $dashData = $this->CydCommon->getDashboardIdByName($dashboardtitle, $preventAccess);
            $this->set('dashDataFile', (DASHBOARD_DATA_FILE_DIR."/". $dashData->_id ."_".DASHBOARD_DATA_FILE_NAME."_". $dashData->dashboardversion .".js"));

$event = object(Cake\Event\Event) {
	data => null
	result => null
	[protected] _name => 'Controller.initialize'
	[protected] _subject => object(App\Controller\PublishController) {}
	[protected] _stopped => false
}
$session = object(Cake\Network\Session) {
	[protected] _engine => null
	[protected] _started => null
	[protected] _lifetime => '86400'
	[protected] _isCLI => false
}
$MDashboardObj = object(Cake\ORM\Table) {

	'registryAlias' => 'MDashboards',
	'table' => 'm_dashboards',
	'alias' => 'MDashboards',
	'entityClass' => '\Cake\ORM\Entity',
	'associations' => [],
	'behaviors' => [],
	'defaultConnection' => 'default',
	'connectionName' => 'default'

}
$isLoggedin = false
$dashid = ''
$preventAccess = 'Yes'
$dashboardtitle = 'dashboard'
$dashData = ''

App\Controller\AppController::beforeFilter() - APP/Controller/AppController.php, line 97
App\Controller\PublishController::beforeFilter() - APP/Controller/PublishController.php, line 26
Cake\Event\EventManager::_callListener() - CORE/src/Event/EventManager.php, line 421
Cake\Event\EventManager::dispatch() - CORE/src/Event/EventManager.php, line 386
Cake\Controller\Controller::dispatchEvent() - CORE/src/Event/EventDispatcherTrait.php, line 78
Cake\Controller\Controller::startupProcess() - CORE/src/Controller/Controller.php, line 497
Cake\Http\ActionDispatcher::_invoke() - CORE/src/Http/ActionDispatcher.php, line 120
Cake\Http\ActionDispatcher::dispatch() - CORE/src/Http/ActionDispatcher.php, line 99
Cake\Http\BaseApplication::__invoke() - CORE/src/Http/BaseApplication.php, line 82
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Routing\Middleware\RoutingMiddleware::__invoke() - CORE/src/Routing/Middleware/RoutingMiddleware.php, line 52
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Routing\Middleware\AssetMiddleware::__invoke() - CORE/src/Routing/Middleware/AssetMiddleware.php, line 88
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Error\Middleware\ErrorHandlerMiddleware::__invoke() - CORE/src/Error/Middleware/ErrorHandlerMiddleware.php, line 51
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Http\Runner::run() - CORE/src/Http/Runner.php, line 51

Notice (8): Trying to get property of non-object [APP/Controller/AppController.php, line 99]

Code Context

            $this->set('dashDataFile', (DASHBOARD_DATA_FILE_DIR."/". $dashData->_id ."_".DASHBOARD_DATA_FILE_NAME."_". $dashData->dashboardversion .".js"));
            
            $this->set('dashid', $dashData->_id);

$event = object(Cake\Event\Event) {
	data => null
	result => null
	[protected] _name => 'Controller.initialize'
	[protected] _subject => object(App\Controller\PublishController) {}
	[protected] _stopped => false
}
$session = object(Cake\Network\Session) {
	[protected] _engine => null
	[protected] _started => null
	[protected] _lifetime => '86400'
	[protected] _isCLI => false
}
$MDashboardObj = object(Cake\ORM\Table) {

	'registryAlias' => 'MDashboards',
	'table' => 'm_dashboards',
	'alias' => 'MDashboards',
	'entityClass' => '\Cake\ORM\Entity',
	'associations' => [],
	'behaviors' => [],
	'defaultConnection' => 'default',
	'connectionName' => 'default'

}
$isLoggedin = false
$dashid = ''
$preventAccess = 'Yes'
$dashboardtitle = 'dashboard'
$dashData = ''

App\Controller\AppController::beforeFilter() - APP/Controller/AppController.php, line 99
App\Controller\PublishController::beforeFilter() - APP/Controller/PublishController.php, line 26
Cake\Event\EventManager::_callListener() - CORE/src/Event/EventManager.php, line 421
Cake\Event\EventManager::dispatch() - CORE/src/Event/EventManager.php, line 386
Cake\Controller\Controller::dispatchEvent() - CORE/src/Event/EventDispatcherTrait.php, line 78
Cake\Controller\Controller::startupProcess() - CORE/src/Controller/Controller.php, line 497
Cake\Http\ActionDispatcher::_invoke() - CORE/src/Http/ActionDispatcher.php, line 120
Cake\Http\ActionDispatcher::dispatch() - CORE/src/Http/ActionDispatcher.php, line 99
Cake\Http\BaseApplication::__invoke() - CORE/src/Http/BaseApplication.php, line 82
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Routing\Middleware\RoutingMiddleware::__invoke() - CORE/src/Routing/Middleware/RoutingMiddleware.php, line 52
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Routing\Middleware\AssetMiddleware::__invoke() - CORE/src/Routing/Middleware/AssetMiddleware.php, line 88
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Error\Middleware\ErrorHandlerMiddleware::__invoke() - CORE/src/Error/Middleware/ErrorHandlerMiddleware.php, line 51
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Http\Runner::run() - CORE/src/Http/Runner.php, line 51

Notice (8): Trying to get property of non-object [APP/Controller/AppController.php, line 100]

Code Context

            
            $this->set('dashid', $dashData->_id);
            $dashboardSetting = json_decode($dashData->settings, true);

$event = object(Cake\Event\Event) {
	data => null
	result => null
	[protected] _name => 'Controller.initialize'
	[protected] _subject => object(App\Controller\PublishController) {}
	[protected] _stopped => false
}
$session = object(Cake\Network\Session) {
	[protected] _engine => null
	[protected] _started => null
	[protected] _lifetime => '86400'
	[protected] _isCLI => false
}
$MDashboardObj = object(Cake\ORM\Table) {

	'registryAlias' => 'MDashboards',
	'table' => 'm_dashboards',
	'alias' => 'MDashboards',
	'entityClass' => '\Cake\ORM\Entity',
	'associations' => [],
	'behaviors' => [],
	'defaultConnection' => 'default',
	'connectionName' => 'default'

}
$isLoggedin = false
$dashid = ''
$preventAccess = 'Yes'
$dashboardtitle = 'dashboard'
$dashData = ''

App\Controller\AppController::beforeFilter() - APP/Controller/AppController.php, line 100
App\Controller\PublishController::beforeFilter() - APP/Controller/PublishController.php, line 26
Cake\Event\EventManager::_callListener() - CORE/src/Event/EventManager.php, line 421
Cake\Event\EventManager::dispatch() - CORE/src/Event/EventManager.php, line 386
Cake\Controller\Controller::dispatchEvent() - CORE/src/Event/EventDispatcherTrait.php, line 78
Cake\Controller\Controller::startupProcess() - CORE/src/Controller/Controller.php, line 497
Cake\Http\ActionDispatcher::_invoke() - CORE/src/Http/ActionDispatcher.php, line 120
Cake\Http\ActionDispatcher::dispatch() - CORE/src/Http/ActionDispatcher.php, line 99
Cake\Http\BaseApplication::__invoke() - CORE/src/Http/BaseApplication.php, line 82
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Routing\Middleware\RoutingMiddleware::__invoke() - CORE/src/Routing/Middleware/RoutingMiddleware.php, line 52
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Routing\Middleware\AssetMiddleware::__invoke() - CORE/src/Routing/Middleware/AssetMiddleware.php, line 88
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Error\Middleware\ErrorHandlerMiddleware::__invoke() - CORE/src/Error/Middleware/ErrorHandlerMiddleware.php, line 51
Cake\Http\Runner::__invoke() - CORE/src/Http/Runner.php, line 65
Cake\Http\Runner::run() - CORE/src/Http/Runner.php, line 51

/var/www/html/egyptsdgobservatory/vendor/cakephp/cakephp/src/Http/Server.php toggle arguments

	`{`
	`if (!$emitter) {`
	`$emitter = new SapiStreamEmitter();`
	`}`
	`$emitter->emit($response);`
	`}`

	`/**`
	`* Set the application.`

object(Zend\Diactoros\Response) {
	[protected] headers => [
		'X-DEBUGKIT-ID' => [
			(int) 0 => '6014fd34-b3dd-4ce3-8edf-9c53d82d0913'
		],
		'Content-Type' => [
			(int) 0 => 'text/html'
		]
	]
	[protected] headerNames => [
		'x-debugkit-id' => 'X-DEBUGKIT-ID',
		'content-type' => 'Content-Type'
	]
	[private] phrases => [
		(int) 100 => 'Continue',
		(int) 101 => 'Switching Protocols',
		(int) 102 => 'Processing',
		(int) 200 => 'OK',
		(int) 201 => 'Created',
		(int) 202 => 'Accepted',
		(int) 203 => 'Non-Authoritative Information',
		(int) 204 => 'No Content',
		(int) 205 => 'Reset Content',
		(int) 206 => 'Partial Content',
		(int) 207 => 'Multi-status',
		(int) 208 => 'Already Reported',
		(int) 300 => 'Multiple Choices',
		(int) 301 => 'Moved Permanently',
		(int) 302 => 'Found',
		(int) 303 => 'See Other',
		(int) 304 => 'Not Modified',
		(int) 305 => 'Use Proxy',
		(int) 306 => 'Switch Proxy',
		(int) 307 => 'Temporary Redirect',
		(int) 400 => 'Bad Request',
		(int) 401 => 'Unauthorized',
		(int) 402 => 'Payment Required',
		(int) 403 => 'Forbidden',
		(int) 404 => 'Not Found',
		(int) 405 => 'Method Not Allowed',
		(int) 406 => 'Not Acceptable',
		(int) 407 => 'Proxy Authentication Required',
		(int) 408 => 'Request Time-out',
		(int) 409 => 'Conflict',
		(int) 410 => 'Gone',
		(int) 411 => 'Length Required',
		(int) 412 => 'Precondition Failed',
		(int) 413 => 'Request Entity Too Large',
		(int) 414 => 'Request-URI Too Large',
		(int) 415 => 'Unsupported Media Type',
		(int) 416 => 'Requested range not satisfiable',
		(int) 417 => 'Expectation Failed',
		(int) 418 => 'I'm a teapot',
		(int) 422 => 'Unprocessable Entity',
		(int) 423 => 'Locked',
		(int) 424 => 'Failed Dependency',
		(int) 425 => 'Unordered Collection',
		(int) 426 => 'Upgrade Required',
		(int) 428 => 'Precondition Required',
		(int) 429 => 'Too Many Requests',
		(int) 431 => 'Request Header Fields Too Large',
		(int) 451 => 'Unavailable For Legal Reasons',
		(int) 500 => 'Internal Server Error',
		(int) 501 => 'Not Implemented',
		(int) 502 => 'Bad Gateway',
		(int) 503 => 'Service Unavailable',
		(int) 504 => 'Gateway Time-out',
		(int) 505 => 'HTTP Version not supported',
		(int) 506 => 'Variant Also Negotiates',
		(int) 507 => 'Insufficient Storage',
		(int) 508 => 'Loop Detected',
		(int) 511 => 'Network Authentication Required'
	]
	[private] reasonPhrase => ''
	[private] statusCode => (int) 200
	[private] protocol => '1.1'
	[private] stream => object(Zend\Diactoros\Stream) {
		[protected] resource => resource
		[protected] stream => 'php://memory'
	}
}

/var/www/html/egyptsdgobservatory/webroot/index.php toggle arguments

	`$server = new Server(new Application(dirname(__DIR__) . '/config'));`

	`// Run the request/response through the application`
	`// and emit the response.`
	`$server->emit($server->run());`

object(Zend\Diactoros\Response) {
	[protected] headers => [
		'X-DEBUGKIT-ID' => [
			(int) 0 => '6014fd34-b3dd-4ce3-8edf-9c53d82d0913'
		],
		'Content-Type' => [
			(int) 0 => 'text/html'
		]
	]
	[protected] headerNames => [
		'x-debugkit-id' => 'X-DEBUGKIT-ID',
		'content-type' => 'Content-Type'
	]
	[private] phrases => [
		(int) 100 => 'Continue',
		(int) 101 => 'Switching Protocols',
		(int) 102 => 'Processing',
		(int) 200 => 'OK',
		(int) 201 => 'Created',
		(int) 202 => 'Accepted',
		(int) 203 => 'Non-Authoritative Information',
		(int) 204 => 'No Content',
		(int) 205 => 'Reset Content',
		(int) 206 => 'Partial Content',
		(int) 207 => 'Multi-status',
		(int) 208 => 'Already Reported',
		(int) 300 => 'Multiple Choices',
		(int) 301 => 'Moved Permanently',
		(int) 302 => 'Found',
		(int) 303 => 'See Other',
		(int) 304 => 'Not Modified',
		(int) 305 => 'Use Proxy',
		(int) 306 => 'Switch Proxy',
		(int) 307 => 'Temporary Redirect',
		(int) 400 => 'Bad Request',
		(int) 401 => 'Unauthorized',
		(int) 402 => 'Payment Required',
		(int) 403 => 'Forbidden',
		(int) 404 => 'Not Found',
		(int) 405 => 'Method Not Allowed',
		(int) 406 => 'Not Acceptable',
		(int) 407 => 'Proxy Authentication Required',
		(int) 408 => 'Request Time-out',
		(int) 409 => 'Conflict',
		(int) 410 => 'Gone',
		(int) 411 => 'Length Required',
		(int) 412 => 'Precondition Failed',
		(int) 413 => 'Request Entity Too Large',
		(int) 414 => 'Request-URI Too Large',
		(int) 415 => 'Unsupported Media Type',
		(int) 416 => 'Requested range not satisfiable',
		(int) 417 => 'Expectation Failed',
		(int) 418 => 'I'm a teapot',
		(int) 422 => 'Unprocessable Entity',
		(int) 423 => 'Locked',
		(int) 424 => 'Failed Dependency',
		(int) 425 => 'Unordered Collection',
		(int) 426 => 'Upgrade Required',
		(int) 428 => 'Precondition Required',
		(int) 429 => 'Too Many Requests',
		(int) 431 => 'Request Header Fields Too Large',
		(int) 451 => 'Unavailable For Legal Reasons',
		(int) 500 => 'Internal Server Error',
		(int) 501 => 'Not Implemented',
		(int) 502 => 'Bad Gateway',
		(int) 503 => 'Service Unavailable',
		(int) 504 => 'Gateway Time-out',
		(int) 505 => 'HTTP Version not supported',
		(int) 506 => 'Variant Also Negotiates',
		(int) 507 => 'Insufficient Storage',
		(int) 508 => 'Loop Detected',
		(int) 511 => 'Network Authentication Required'
	]
	[private] reasonPhrase => ''
	[private] statusCode => (int) 200
	[private] protocol => '1.1'
	[private] stream => object(Zend\Diactoros\Stream) {
		[protected] resource => resource
		[protected] stream => 'php://memory'
	}
}

Could this be caused by using Auto-Tables?

Some of the Table objects in your application were created by instantiating "Cake\ORM\Table" instead of any other specific subclass.

This could be the cause for this exception. Auto-Tables are created for you under the following circumstances:

The class for the specified table does not exist.
The Table was created with a typo: TableRegistry::get('Atricles');
The class file has a typo in the name or incorrect namespace: class Atricles extends Table
The file containing the class has a typo or incorrect casing: Atricles.php
The Table was used using associations but the association has a typo: $this->belongsTo('Atricles')
The table class resides in a Plugin but no plugin notation was used in the association definition.

Please try correcting the issue for the following table aliases:

MDashboards

( ! ) Xdebug: user triggered in /var/www/html/egyptsdgobservatory/src/Template/Error/error500.ctp on line 33
Call Stack
#	Time	Memory	Function	Location
1	0.0730	3792920	Cake\Error\ErrorHandler->wrapAndHandleException( )	.../BaseErrorHandler.php:0
2	0.0730	3792920	Cake\Error\ErrorHandler->handleException( )	.../BaseErrorHandler.php:164
3	0.0730	3792920	Cake\Error\ErrorHandler->_displayException( )	.../BaseErrorHandler.php:180
4	0.0737	3815992	Cake\Error\ExceptionRenderer->render( )	.../ErrorHandler.php:144
5	0.0739	3818288	Cake\Error\ExceptionRenderer->_outputMessage( )	.../ExceptionRenderer.php:194
6	0.0744	3838120	Cake\Error\ExceptionRenderer->_outputMessage( )	.../ExceptionRenderer.php:336
7	0.0744	3838120	Cake\Controller\ErrorController->render( )	.../ExceptionRenderer.php:327
8	0.0746	3840224	App\View\AppView->render( )	.../Controller.php:617
9	0.0748	3841360	App\View\AppView->_render( )	.../View.php:588
10	0.0749	3841848	App\View\AppView->_evaluate( )	.../View.php:964
11	0.0749	3860600	include( '/var/www/html/egyptsdgobservatory/src/Template/Error/error500.ctp' )	.../View.php:1005
12	0.0751	3878352	xdebug_print_function_stack ( )	.../error500.ctp:33

If you want to customize this error message, create src/Template/Error/error500.ctp