Eclipse EPIC Bug? Can't change Perl Include Path

I am working on a small Perl program in Eclipse that includes my own Perl module. This module is saved in my current project workspace, so it should be included in the default Perl include path, but Eclipse has one of those annoying red x's telling me it can't find the module. When I hover over the "x", he says:

Cannot be found in @INC (@INC contains: C: / Perl64 / site / lib C: / Perl64 / lib)

I went into my project properties and tried to change "Perl Include Path" to include "." (Current working directory) but it won't let me add the include path.

I can't add anything to the include path, not even to another directory. Second, I click "OK". I am getting this error message:

I even get an error if I don't make any changes at all! If I just go to this page in Project Properties and click OK, I get an error without even adding Perl's Include Path.

Does anyone know what's going on here? I've searched the internet for a few days now, no luck. I haven't seen anyone else who has the same problem or something similar. This is very frustrating and I appreciate any help.

thank

EDIT:

Here is some information about my version of Eclipse, just in case, that helps solve this problem.

Additional Information:

After worrying a bit about it, I realized that if I go into the "Property in Perl Include Path" property section at all, even if we don't change it and leave it and click "OK" in another section, I still get error message. Somehow this error is caused by simply clicking on the "Include Perl Path" tab without doing anything else.