Symptoms:
The following error message occurs when creating a new project based on an existing project.

"Invalid Base Project. The Base Project has one or more required UDF(s) empty."

Cause:
This error occurs when a mandatory UDF is empty in the template project. This usually happens when a mandatory UDF is set up after the template project is created. The Project/Task Level UDF can be empty at either the Project level or any one of the Task level to reproduce this state of the error.

Resolution:
In the template project, make sure all the mandatory UDF's in the project and tasks, are populated with the relevant information.