Flare "previously generated files" error

If you are outputting from Madcap Flare to FrameMaker and, when you try to generate the output, you get the error message:

"One or more previously generated files are open in Adobe Framemaker"

but FrameMaker isn't running, the problem is almost certainly that FrameMaker exited without cleaning up one or more of its lock files.

The solution is to go to the output directory and delete any files with the extension .lck.

Alternatively, just wipe the entire contents of your output directory and regenerate the output from Flare.