Is that really all/exactly the code in your module? If this is the case, your module isn't in a package and is just raw perl code. This perl code is getting inserted into your MyClass package which is probably not what you want. I removed the other class and this still generates the error, which leads me to believe this is your problem.

{
  package MyClass;
  use test_func;
 
  test_me('in class');
};
[download]

This is a problem of package scoping test_func.pm should look something like this...

package test_func;

sub test_me {
  #.....
}

1;
[download]

You can then call the test_me as &test_func::test_me from main

I would highly recommend taking a look at the package Exporter.

The perl docs on packages and modules would also be very helpful. perlmod