Internal server error

[Pulppi]

Hello

I installed new plugin yesterday and after that the following error occured:

"Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@sijoitusstrategi.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request."

I checked the error log, and it had a following messages:

"[Fri Aug 03 23:14:16 2012] [error] [client 72.14.199.181] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/sijoitta/public_html/index.php
[Fri Aug 03 23:13:15 2012] [error] [client 72.14.199.181] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/sijoitta/public_html/index.php
[Fri Aug 03 23:13:15 2012] [error] [client 72.14.199.181] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/sijoitta/public_html/index.php
[Fri Aug 03 23:12:15 2012] [error] [client 72.14.199.181] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/sijoitta/public_html/index.php
[Fri Aug 03 23:12:15 2012] [error] [client 72.14.199.181] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/sijoitta/public_html/index.php
[Fri Aug 03 23:11:14 2012] [error] [client 72.14.199.181] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/sijoitta/public_html/index.php
[Fri Aug 03 23:11:14 2012] [error] [client 72.14.199.181] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/sijoitta/public_html/index.php
[Fri Aug 03 23:08:54 2012] [error] [client 91.155.40.13] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/sijoitta/public_html/index.php"

What can I do?