Then try use diagnostics.

Possible unintended interpolation of @rman in string at xxrc_env_test.
+pl line
        51 (#1)
    (W ambiguous) You said something like `@foo' in a double-quoted st
+ring
    but there was no array @foo in scope at the time. If you wanted a
    literal @foo, then write it as \@foo; otherwise find out what happ
+ened
    to the array you apparently lost track of.

Global symbol "@rman" requires explicit package name at xxrc_env_test.
+pl line
        51 (#2)
    (F) You've said "use strict vars", which indicates that all variab
+les
    must either be lexically scoped (using "my"), declared beforehand 
+using
    "our", or explicitly qualified to say which package the global var
+iable
    is in (using "::").

Execution of xxrc_env_test.pl aborted due to compilation errors (#3)
    (F) The final summary message when a Perl compilation fails.
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perlintro covers interpolation.