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XF 1.1 Error 500

#1
Hi there!
Im just new user who try XenForo. Nice forum script as i see.
But i have interesting trouble. Then type forum url like www.forum.com and hit enter... i see
Internal Server Error 500.

Then open logs i see:
Code:
[Fri Jul 13 22:55:31] [error] PHP Warning:  Unknown: Unable to allocate memory for pool. in Unknown on line 0
[Fri Jul 13 22:55:31] [error] PHP Warning:  require() [<a href='function.require'>function.require</a>]: Unable to allocate memory for pool. in /home/public_html/admin.php on line 6
 
[Fri Jul 13 22:55:31] [error] PHP Warning:  include() [<a href='function.include'>function.include</a>]: Unable to allocate memory for pool. in /home/public_html/library/XenForo/Autoloader.php on line 119
 
[Fri Jul 13 22:55:31] [error] PHP Warning:  include() [<a href='function.include'>function.include</a>]: Unable to allocate memory for pool. in /home/public_html/library/XenForo/Autoloader.php on line 119
 
[Fri Jul 13 22:55:31] [error] PHP Fatal error:  Exception thrown without a stack frame in Unknown on line 0
Code:
[Sat Jul 14 18:13:52 2012] [error] PHP Fatal error:  Uncaught exception 'ErrorException' with message 'include() [<a href='function.include'>function.include</a>]: Unable to allocate memory for pool.' in /home/library/XenForo/Autoloader.php:119\nStack trace:\n#0 /home/library/XenForo/Autoloader.php(119): XenForo_Application::handlePhpError(2, 'include() [<a h...', '/home/...', 119, Array)\n#1 /home/library/XenForo/Autoloader.php(119): XenForo_Autoloader::autoload()\n#2 [internal function]: XenForo_Autoloader->autoload('XenForo_Error')\n#3 /home/library/XenForo/Application.php(294): spl_autoload_call('XenForo_Error')\n#4 [internal function]: XenForo_Application::handleException(Object(ErrorException))\n#5 {main}\n  thrown in /home/library/XenForo/Autoloader.php on line 119, referer: http://domain.pro/forum/
I'm using simple webhosting with php5+APC support. My hosting supported all forum requirements.

Very interesting...if wait sometimes like 5-10-15 minutes forum works again! :(

What is the problem, how do u think?