No root path(s) specified at webmux.pl line 111

Hi LIST:
i just configured RT 3.4.1, everything seems to work fine but getting
this error on console
[ERROR}
Starting httpd: No root path(s) specified at /usr/bin/webmux.pl line 111
[ OK ]
[/ERROR]

on line 111 in above file
rmtree([ bsd_glob("$RT::MasonDataDir/obj/*") ], 0, 1);

any hint ??

Thanks,

i just configured RT 3.4.1, everything seems to work fine but getting this error on console
[ERROR}
Starting httpd: No root path(s) specified at /usr/bin/webmux.pl line 111
Nadeem, this error implies that your apache can’t write var/mason_data/obj