Xampp suddenly requesting 32bit os

[sophauer]

This is very strange, because it was working without problems. I don't know exactly what happened!
when i tried to restart XAMPP by /opt/lampp/lampp restart
Centos 6.5 64 bit system showed:
XAMPP is currently only availably as 32 bit application. Please use a 32 bit compatibility library for your system.

same as lampp status or stop