Chances are this is something with the .htaccess file. To fix this do the following:
ForceType application/x-httpd-php
#SetHandler application/x-httpd-php
#SetHandler application/x-httpd-php5
#ForceType x-httpd-php
Try the next one by moving the commenting #
# ForceType application/x-httpd-php
SetHandler application/x-httpd-php
#SetHandler application/x-httpd-php5
#ForceType x-httpd-php
Still no go
Try the next variation.
#ForceType application/x-httpd-php
#SetHandler application/x-httpd-php
SetHandler application/x-httpd-php5
#ForceType x-httpd-php
and so on.
This should fix your error.
