The error is:
Some of Horde’s configuration files are missing or unreadable conf.php

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#arch .

check whether it is 32 bit or 64
if it is 64 bit nothing to do ..ask then to upgrade to 32.

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chmod 755 /home/kloxo/httpd/webmail/horde/config/conf.php

/script/fix
/script/fixmail
/script/upcp
/script/fixhorde