This error message may display if you are launching the application.
In this event, it may be helpful please clear the cache files on your machine (previously stored results/settings).
This may be done by browsing to the FenestraPro folder on your machine if you have local permission. You may require IT help if user permissions are restricted.
This may be found at C:\Users\YOUR USERNAME\AppData\Local\FenestraPro. All files here may be safely deleted as they will be recreated when you launch the application again. Results and Settings for previous models will be removed however and will need to be calculated again.
Please then relaunch the application and sign in with your credentials.