Can't generate pdf report for planning

Hello

I a m trying to generate from reports menu, the gant planning of a little project, the duration is about 6 months.
after many minutes, i have this message in the attached file( print) in the screen.
I open the log file of projector and i get this lines:
2020-09-08 14:20:50.938 ***** ERROR ***** [V8.5.3] ERROR *****
2020-09-08 14:20:50.938 ***** ERROR ***** [V8.5.3] on file 'C:\wamp64\www\projectbox\view\objectDetail.php' at line (8906)
2020-09-08 14:20:50.938 ***** ERROR ***** [V8.5.3] cause = ob_get_clean(): failed to discard buffer of zlib output compression (1)
I verify in php.in and confirm the configuration of output conpression: zlib.output_compression = Off
I restart the server and after i never get the error ob_get_clean.


However i can't get the pdf generation from reports menu, i circle the action done in the action.png

in the php_error.log i get these lines:
08-Sep-2020 15:56:45 Europe/Paris] PHP Fatal error: Maximum execution time of 300 seconds exceeded in C:\wamp64\www\projectbox\external\html2pdf\src\Parsing\Css.php on line 1485
[08-Sep-2020 15:56:45 Europe/Paris] PHP Stack trace:
[08-Sep-2020 15:56:45 Europe/Paris] PHP 1. {main}() C:\wamp64\www\projectbox\view\print.php:0
[08-Sep-2020 15:56:45 Europe/Paris] PHP 2. finalizePrint() C:\wamp64\www\projectbox\view\print.php:252
[08-Sep-2020 15:56:45 Europe/Paris] PHP 3. Spipu\Html2Pdf\Html2Pdf->writeHTML() C:\wamp64\www\projectbox\view\print.php:309
[08-Sep-2020 15:56:45 Europe/Paris] PHP 4. Spipu\Html2Pdf\Html2Pdf->_makeHTMLcode() C:\wamp64\www\projectbox\external\html2pdf\src\Html2Pdf.php:611
[08-Sep-2020 15:56:45 Europe/Paris] PHP 5. Spipu\Html2Pdf\Html2Pdf->_executeAction() C:\wamp64\www\projectbox\external\html2pdf\src\Html2Pdf.php:1423
[08-Sep-2020 15:56:45 Europe/Paris] PHP 6. Spipu\Html2Pdf\Html2Pdf->_tag_open_TD() C:\wamp64\www\projectbox\external\html2pdf\src\Html2Pdf.php:1455
[08-Sep-2020 15:56:45 Europe/Paris] PHP 7. Spipu\Html2Pdf\Parsing\Css->analyse() C:\wamp64\www\projectbox\external\html2pdf\src\Html2Pdf.php:5541
[08-Sep-2020 15:56:45 Europe/Paris] PHP 8. Spipu\Html2Pdf\Parsing\Css->getFromCSS() C:\wamp64\www\projectbox\external\html2pdf\src\Parsing\Css.php:653
[08-Sep-2020 15:56:45 Europe/Paris] PHP 9. Spipu\Html2Pdf\Parsing\Css->getReccursiveStyle() C:\wamp64\www\projectbox\external\html2pdf\src\Parsing\Css.php:1435
[08-Sep-2020 13:56:45 UTC] PHP Fatal error: Maximum execution time of 120 seconds exceeded in C:\wamp64\www\projectbox\tool\projeqtor.php on line 1612
[08-Sep-2020 13:56:45 UTC] PHP Stack trace:
[08-Sep-2020 13:56:45 UTC] PHP 1. {main}() C:\wamp64\www\projectbox\tool\checkAlertToDisplay.php:0
[08-Sep-2020 13:56:45 UTC] PHP 2. require_once() C:\wamp64\www\projectbox\tool\checkAlertToDisplay.php:29
[08-Sep-2020 13:56:45 UTC] PHP 3. session_start() C:\wamp64\www\projectbox\tool\projeqtor.php:44
[08-Sep-2020 13:56:45 UTC] PHP 4. spl_autoload_call() C:\wamp64\www\projectbox\tool\projeqtor.php:44
[08-Sep-2020 13:56:45 UTC] PHP 5. projeqtorAutoload() C:\wamp64\www\projectbox\tool\projeqtor.php:44
[08-Sep-2020 13:56:45 UTC] PHP Fatal error: Maximum execution time of 120 seconds exceeded in C:\wamp64\www\projectbox\tool\projeqtor.php on line 44
[08-Sep-2020 13:56:45 UTC] PHP Stack trace:
[08-Sep-2020 13:56:45 UTC] PHP 1. {main}() C:\wamp64\www\projectbox\tool\saveDataToSession.php:0
[08-Sep-2020 13:56:45 UTC] PHP 2. require_once() C:\wamp64\www\projectbox\tool\saveDataToSession.php:30
[08-Sep-2020 13:56:45 UTC] PHP Fatal error: Maximum execution time of 120 seconds exceeded in C:\wamp64\www\projectbox\tool\projeqtor.php on line 44
[08-Sep-2020 13:56:45 UTC] PHP Stack trace:
[08-Sep-2020 13:56:45 UTC] PHP 1. {main}() C:\wamp64\www\projectbox\view\shortcut.php:0
[08-Sep-2020 13:56:45 UTC] PHP 2. require_once() C:\wamp64\www\projectbox\view\shortcut.php:27

Can you help me.
Today we had only 5 project added and we want to go to more than 50 before the end of the year.

Best regards