Unable to add walls "A serious error has occurred. The current action has been cancelled."

[Anonymous]

Hello, 

I am taking an intro to Revit course right now, and after modeling most of my building I am now getting an error message whenever I try to use the wall tool. It give me the error message "A serious error has occurred. The current action has been cancelled. It is strongly recommended that you save your work in a new file before continuing. Would you like to save a recovery file?".

For some more information, I am trying to model St Mary's Church by Douglas Cardinal, and I have used a bunch of imported CAD void forms to trim the curved walls and roof. 

Thanks! 

 

[ToanDN · Accepted solution]

Audit the file.

For this type of buildings I would model as a conceptual mass and use Wall/Roof By face.