Word VBA getting Project is Unviewable error

Question

When I try to edit or step into my VBA code for debugging purpose I get "Project is Unviewable". I have created .dotm file at location (C:\Users\UserName\AppData\Roaming\Microsoft\Word\STARTUP).

Answer 1

Update 2022

When editing macro-enabled Word documents (for example, .docm files) that are stored on OneDrive, you may receive the following warning:

SECURITY WARNING
Macros have been disabled.
Enabled Content

After clicking Enabled Content, and opening the VBA editor, attempting to view the project may result in the error:
Project is unviewable

After closing and reopening the document, again open the VBA editor. Within the Word document, you will then receive the following message:

EDITING MACROS
Check out this document to view and edit its macros.
Check Out

After checking out out the document, macros may be edited.