When creating a new project, the warning window, "Project Folder Already Used" indicates that a project was created in the existing folder OR a Parent folder.

Whenever a project is created, the program looks in the current folder and any parent folders to see if a project has been created. It's just a warning message. Clicking "Yes" to this warning message is harmless and will not corrupt any data.

To get rid of the message, do the following:

• Click on View / Project List.
• Right click on the "Project Folder" heading and select "Sort by Folder, Ascending".
• 
• Click on the "Sel" box for the project located in the folder shown in the warning window.
• Click on the "Do Select" button.
• 
• At this point, you can "Backup Selected Project". 
• After backing up the project, you can perform the same process to "Delete the selected project".

Once the project is deleted, you should not receive the "Project Folder Already Used" message.