In addition to the other comments, I recommend new programmers also use diagnostics. Not only does that give you more information about the error, it also gives you suggestions on how to fix it. Here's the output I get when I include that:
Global symbol "$another_variable" requires explicit package name at di
+ag.pl line 6.
Execution of diag.pl aborted due to compilation errors (#1)
(F) You've said "use strict" or "use strict vars", which indicates
that all variables must either be lexically scoped (using "my" or
declared beforehand using "our", or explicitly qualified to say
which package the global variable is in (using "::").
Uncaught exception from user code:
Global symbol "$another_variable" requires explicit package na
+me at diag.pl line 6.
Execution of diag.pl aborted due to compilation errors.
at diag.pl line 6
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