don work cgi-bin

[kionchan]

the files is: vu2002 www-data 37 2008-05-09 12:31 helloworld.pl
now, I change to vu2002 vu2002 37 2008-05-09 12:31 helloworld.pl, change group.
Now, in web show internal server error in log suexec.log say this: [2008-05-09 13:55:05]: uid: (2002/vu2002) gid: (2002/2002) cmd: helloworld.pl, it seems workly, but don't work... Can Do it the file .pl is wrong? have you any file in perl workly?

in file its:
#!/usr/bin/perl
print "hello world";

down promt work perfectly