The error described is caused if you are attempting to save your LabAuthor Experiment in a location that LabAuthor has recognized as a LabTutor Experiment Folder:
1. 'experiment' XML File:2. 'experiment' LabTutor Experiment Control File:
If either of these files are in the location you are trying to save to, the error message will appear- to resolve this you will need to select a different (valid) save location.