UT theoretical chemistry code forum

If i use the command chgsum.pl AECCAR0 AECCAR2
output is,
Can't open file No such file or directory at /root/SOFTWARES/vtstscripts/chgsum.pl line 6.

I have downloaded the vtstscripts.tar.gz and unzipped. Then defined the path in .bash_profile.
Tried to sum the 2 charge density files using the chgsum.pl script using the command
chgsum.pl (AECCAR0) (AECCAR2) (fact1) (fact2)
I got the error,
bash: syntax error near unexpected token `AECCAR0'

Any ...