I created a user form this morning, and after I created and when I opened the
user form (by opening the Excel file containing the user form), it crashed.
After it crashed and the Excel file restored and repaired, I got a message
that I lost my entire VBAProject. When I checked it, I did lose it.

So I created again for second time. This time the form opened, and I was
able to navigate to other forms. When I clicked on the Close button on the
main form, it crashed again. I have never had this experience.

Does anyone know why it keeps crashing?

I don't know this would be an issue. I created those user forms to lookup
the information from the sheet in that Excel file.

Thanks.