Error 500 CakePHP 3 - cakephp

Question

I've an error 500 that I don't understand. The error was here before I begin to work on this project so it's complicated. When I click on button to open a PDF (with html2pdf), the error 500 appear. I've tried all I've found, but nothings works.
I can't send you code, or maybe few lines.
Output from error log:
2017-07-03 14:04:28 Error: Fatal Error (1): Maximum execution time of
60 seconds exceeded in [C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\Error\BaseErrorHandler.php,
line 126] Request URL: /fra/my-leads/view/aekt.pdf Referer URL:
http://localhost:8765/fra/my-leads Trace:
Cake\Error\BaseErrorHandler::handleFatalError() -
CORE\src\Error\BaseErrorHandler.php, line 223
Cake\Error\BaseErrorHandler::Cake\Error{closure}() -
CORE\src\Error\BaseErrorHandler.php, line 105 [main] - [internal],
line ??
2017-07-03 14:04:28 Error: [Cake\Error\FatalErrorException] Maximum
execution time of 60 seconds exceeded Request URL:
/fra/my-leads/view/aekt.pdf Referer URL:
http://localhost:8765/fra/my-leads Stack Trace: 0 C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\Error\BaseErrorHandler.php(105):
Cake\Error\BaseErrorHandler->handleFatalError(1, 'Maximum executi...',
'C:\Users\JCP 2...', 126) 1 [internal function]:
Cake\Error\BaseErrorHandler->Cake\Error{closure}() 2 {main}
More precision : when I just write "hello" in pdf, I don't have error. It's only when I try to get datas. And when I set this pdf to another view (so without pdf format) it works :/
Log output after increasing execution time
2017-07-04 08:19:08 Error: [Spipu\Html2Pdf\Exception\ImageException]
Unable to get the size of the image
[http://localhost:8765/img/logo.png?1497859287] Request URL:
/fra/my-leads/view/trkkdz.pdf Referer URL:
http://localhost:8765/fra/my-leads
I try to comment the logo and now, it says this :
2017-07-04 08:23:06 Error: [Exception] TCPDF ERROR: Some data has
already been output, can't send PDF file Request URL:
/fra/my-leads/view/trkkdz.pdf Referer URL: ... Stack Trace: 0
C:\Users\JCP
2\Documents\buyers\vendor\tecnickcom\tcpdf\tcpdf.php(7620):
TCPDF->Error('Some data has a...') 1 C:\Users\JCP
2\Documents\buyers\vendor\spipu\html2pdf\src\Html2Pdf.php(506):
TCPDF->Output('MLC_Lead-trkkdz...', 'I') 2 C:\Users\JCP
2\Documents\buyers\src\Template\Layout\pdf\default.ctp(10):
Spipu\Html2Pdf\Html2Pdf->output('MLC_Lead-trkkdz...') 3 C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\View\View.php(1010):
include('C:\Users\JCP 2...') 4 C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\View\View.php(971):
Cake\View\View->_evaluate('C:\Users\JCP 2...', Array) 5 C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\View\View.php(642):
Cake\View\View->_render('C:\Users\JCP 2...') 6 C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\View\View.php(600):
Cake\View\View->renderLayout('', 'default') 7 C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\Controller\Controller.php(623):
Cake\View\View->render(NULL, NULL) 8 C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\Http\ActionDispatcher.php(125):
Cake\Controller\Controller->render() 9 C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\Http\ActionDispatcher.php(93):
Cake\Http\ActionDispatcher->_invoke(Object(App\Controller\MyLeadsController))
10 C:\Users\JCP
2\Documents\buyers\vendor\cakephp\cakephp\src\Routing\Dispatcher.php(60):
Cake\Http\ActionDispatcher->dispatch(Object(Cake\Http\ServerRequest),
Object(Cake\Http\Response)) 11 C:\Users\JCP
2\Documents\buyers\webroot\index.php(37):
Cake\Routing\Dispatcher->dispatch(Object(Cake\Http\ServerRequest),
Object(Cake\Http\Response)) 12 {main}

Answer 1

This means your application is taking more than 60 seconds to run. That is why it is crushing. Add the code below to index.php in webroot directory
<?php
set_time_limit ( 60 * 5 ); // 5 minutes
?>
or in your php.ini :
max_execution_time=300