CRFCN0039E

Specified class cannot be found in the project

During playback of a test script the specified class cannot be found in the project location specified.
While playing back a script, the corresponding class gets loaded from the project location. If the class file is not present then you get this error.
Ensure that the Test UI project is correct and not corrupted. Try building the project again and ensure that the class is recreated on the file system.