SPUG: need information about ENV in linux platform

[Sachin Chaturvedi]

i am working in linux platform with a perl script.

i am using path /usr/bin/perl for executing a perl .pm file from within the file .

but i am facing a problem that it gives message like 

Can't call method "ENV" without a package or object reference at ....

when there is a reference to ENV . 

Is this problem with perl version as this script has been written for perl5plus and i am using /bin/perl OR

i have to include some package for getting this work

Thanks

Sachin