For the error message: Unable to save the file <file name>.dxp
DirectoryNotFound
Could not find a part of the path
This error can be caused by deletion of temp folders, which commonly happens when running clean up, malware or other software that cleans up a user's drives. The only way to fix the error is to restart, and the temp folder will be recreated. Work done during the analysis session where the error was generated will be lost.