I am facing a pretty strange problem. I have installed Drupal 7 on my site. Whenever I install a module and tries to access the module's configure page after enabling the module, it leads me to simply /admin/config page without showing the option for that particular module configuration.

sometimes when I do a clear cache the problem gets resolved and then I can access the module's config page. but sometime after installing a module, clear cache gives Internal Server Error 500 .. also I tried to flush the cache manually by making a php file into / directory with the following code:

include_once './includes/bootstrap.inc';

but this also gives Error 500.

When I disable the installed module, clear cache works as usual... please help me.

  • What are the permissions on the root folder ? – aerozeppelin Sep 4 '12 at 18:57
  • @aerozeppelin I am using shared hosting so can not set permissions on root folder, btw .php files are working when placed in root folder – Deepak Sep 4 '12 at 19:11
  • I am not sure about this, but you could try increasing your php memory limit and then check if the problem still persists. – aerozeppelin Sep 4 '12 at 19:21
  • @aerozeppelin I have also tried by setting ini_set('memory_limit', '64M'); in settings.php but problem remains the same – Deepak Sep 4 '12 at 19:29
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    Try increasing it to 256M or 512M, and then check. – aerozeppelin Sep 4 '12 at 19:36

As directed by aerozeppelin I got the following error:

Fatal error: Allowed memory size of 50331648 bytes exhausted (tried to allocate 4096 bytes) in /home/htdocs/includes/database/query.inc on line 1857

So increasing the PHP memory limit is the cure; this link is useful for that.

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In a file type


to know your php configuration. Here you can know the path of php error_log or type


to get the last error that occurred.

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  • erro_log is set to no value unfortunately my hosting provider does not seem to provide that feature can I explicitly set it? – Deepak Sep 4 '12 at 20:08
  • whats the output of <?php print_r(error_get_last()); ?> – aerozeppelin Sep 4 '12 at 20:10
  • I am getting no output (blank) – Deepak Sep 4 '12 at 20:20
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    Try setting the error log using the following link, php.net/manual/en/errorfunc.configuration.php#ini.error-log. Without the error logs it would be a challenge to pin point the error. – aerozeppelin Sep 4 '12 at 20:36
  • So i guess increasing the php memory limit of your server fixed this problem. Right? – ANDiTKO Sep 5 '12 at 7:44

May be this is a late answer.But it will help for new people.

  1. Try to add this in .htaccess file.

php_value memory_limit 64M

I hope this will help you to solve the Internal Server Error in Drupal 7

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  • It's rather improbable that a php.ini in the root directory would be used from PHP. – kiamlaluno Mar 9 '16 at 6:05
  • yes adding php.ini is not a good method.But i could find it in few projects! – Hari kris Mar 9 '16 at 6:28

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