Getting an error while starting Grav CMS

Support
1

Getting below error while starting Grav CMS

gravcms
gravcms1753×875 98.5 KB

2

Check write permissions

3

@bedoonraj, The information you’ve provided is not sufficient enough to pinpoint the issue.

Please provide the following information:

  • when does it happen?
    • when using Admin,
    • or when using the website?
  • the top 10 errors from the error logfile in /logs/grav.log
  • a list of plugins you are using
  • the theme you are using
4

@pamtbaau I’m first time downloading this tool. What i have done so far is

  1. Download and Installed PHP (8.4.7)
  2. Download and extracted Grav Core+Admin Plugin
  3. With CMD, executed php -S localhost:8000 system/router.php

After doing i’m getting this error:

[2025-05-20 06:32:30] grav.CRITICAL: Failed to start session: session_start(): Session cannot be started after headers have already been sent - Trace: #0 C:\grav-admin\system\src\Grav\Common\Session.php(49): Grav\Framework\Session\Session->start() #1 C:\grav-admin\system\src\Grav\Common\Processors\InitializeProcessor.php(452): Grav\Common\Session->init() #2 C:\grav-admin\system\src\Grav\Common\Processors\InitializeProcessor.php(109): Grav\Common\Processors\InitializeProcessor->initializeSession(Object(Grav\Common\Config\Config)) #3 C:\grav-admin\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\InitializeProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #4 C:\grav-admin\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #5 C:\grav-admin\system\src\Grav\Framework\RequestHandler\Middlewares\MultipartRequestSupport.php(40): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #6 C:\grav-admin\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Framework\RequestHandler\Middlewares\MultipartRequestSupport->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #7 C:\grav-admin\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #8 C:\grav-admin\system\src\Grav\Common\Grav.php(312): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #9 C:\grav-admin\index.php(47): Grav\Common\Grav->process() #10 C:\grav-admin\system\router.php(55): require(‘C:\grav-admin\i…’) #11 {main}

5

@bedoonraj, I believe PHP 8.4.x requires Grav 1.8 beta

6

@bedoonraj, Unfortunately, you’ve cross-posted this post on Gravs repo within 6 minutes apart.

In general, it is not very appreciated if users of different forums are being asked the same question. In the end, people of at least one forum are wasting time and effort.

It is OK to cross-post once the first post does not receive a proper answer. But not within 6 minutes, but after a day or so. And when cross-posting, all parties should be notified about the cross-posting and results should be shared in all forums.