Userform code fails when the userform is called from a custom ribbon button

I am not sure how to fix this problem, or even why it is a problem. I created a userform that will list the folders, sub-folders and files in a user selected directory. The user is then able to select the desired items from the list and move them into a "waiting cue" that will copy the items to a user defind destination. Right now I have this userform in a workbook that the user has to referance, and the userform is called from a button located in sheet1. In this format the userform works great.

What I would like to do is call the userform from a custom ribbon button. I have made the userform into an addin and created a custom ribbon tab with a button that calls the userform. when I click the button the userform loads but when the user attempts browse for the source files I get this error: Compile error: User-defined type not defined. I dont understand why the code fails when called from the ribbon but it works when called from a button in the spreadsheet.

I have attached spreadsheet version and the ribbon version for reference.

Thank you very much for the help.

Vendor Info Report.xlsm, Ribbon.zip

Does anyone have any ideas on how to fix this problem?
Thank you for the help.

I found out what was wrong! It turns out that all I needed to do was go into the VBAProject References and select Microsoft Scripting Runtime. References is located under Tools in the VBA Window.