Can't add Domains anymor

I reinstalled my Server yesterday. After installation i was able to add Domains without problem. Then i made an Upgrade and since then Domains won't be added any more.

Debug:
http://pastebin.com/HLFp8biA

I didn't change anything by hand

I post it here, because i don't know if i'm online today. But i will take a look here into forum.

Maybe this have something to do with it:

Quote

Dear admin,

An exception with the following message was thrown in file
/var/www/imscp/gui/include/iMSCP/Initializer.php (Line: 276):

=================================================================

The GUI `phptmp` directory must be writable.
=================================================================

Debug backtrace:
---------------

File: /var/www/imscp/gui/include/iMSCP/Initializer.php (Line: 169)
Method: iMSCP_Initializer::_initializeSession()
File: /var/www/imscp/gui/include/iMSCP/Initializer.php (Line: 98)
Method: iMSCP_Initializer::_processAll()
File: /var/www/imscp/gui/include/environment.php (Line: 255)
Method: iMSCP_Initializer::run()
File: /var/www/imscp/gui/include/imscp-lib.php (Line: 114)
Function: require_once()
File: /var/www/imscp/gui/index.php (Line: 37)
Function: require()

Additional information:
----------------------

Http User Agent: Mozilla/5.0 (compatible; Baiduspider/2.0;
+http://www.baidu.com/search/spider.html)
Request Uri: /
Remote Addr: 220.181.108.170
Server Addr: xx.xx.xx.xx

____________________________________________________________
i-MSCP Exception Mail Writer

Note: If an exception of same type is thrown again, you will not
receive this mail before an expiration time that is currently fixed at
6 hour(s).

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