Fatal error: Failed opening required './includes/config.php'

[3asfour_deutsch]

Fatal error: Failed opening required './includes/config.php' (include_path='.:/usr/share/pear') in /var/www/xxxxxxx/mail/global.php on line 25

hi any one can help i have trying to install hive mail but i have this message i have cheked all dir and file every things seem to be ok it allways this message
before this i have installed Dmail for a while every things works good but after 2it give me the same message i think that the problem is in the server any one know how to fix it please

veeeeeeeeeeeeeeeerrrrrrrrryyyyyyyyy urgent please
alah la ikhalikom la tkhalouni
:shy: :shy: :shy: :shy:

[3asfour_deutsch]

up up up up
up
up
up
up
up
:anger1: :anger2:

[أبوعامر]

الرسالة تقول ان ملف الكونفق غير موجود
وهذا مسار الملف
includes/config.php