I know that the xpath() error is Unresolved problem on oxwall.

However I want to inform forum the different phenomenon.

The same behavior is not causing the same error in my another 32-bit machine.

In my 64bit environment (virtual with OpenVZ),

I uploaded lang-zip file, for example forum topic/17994 or topic/330,

Then, I faced a Fatal error as follow.   

  Fatal error: Call to a member function xpath() on a non-object 

  in /home/******/ow_system_plugins/base/bol/language_service.php on line 452

However there is no problem at my another 32bit linux non-virtual.

The php env. (max mem, file-size, upload-size) are same in both 64bit and 32bit.

My error 64bit environment (virtual with OpenVZ) : 

php PHP-5.3.9

> uname -a

Linux xxxx.xxxx 2.6.32-31-pve #1 SMP Thu Jul 24 06:44:16 CEST 2014 x86_64 x86_64 x86_64 GNU/Linux

> cat /etc/redhat-release

Scientific Linux release 6.5 (Carbon)

My non-error 32bit environment (native machine): 

php PHP-5.3.9

> uname -a

Linux xxxx.xxxx 2.6.18-371.1.2.el5 #1 SMP Tue Oct 22 12:57:43 EDT 2013 i686 i686 i386 GNU/Linux

> cat /etc/redhat-release

CentOS release 5.10 (Final)

Regards