I'm getting this message when opening Traktor, unusable right now.
The log file should be here - '/Users/USERNAME/Documents/Native Instruments/Traktor 4.4.2/Logs'
Check if it's there, and if it is delete it. Then restart Traktor and see if it works. The other thing to check is whether Traktor has access to your documents folder which is set in System Settings→Files and Folders
Yes, the file is at that path, and yes, Traktor has access to the documents folder. Before trying to do your suggestions, I reinstalled Traktor, then moved the Documents folder to the newly download app folder in "Applications". Then it worked fine. But I did the same thing last week and when I went to use Traktor yesterday, again had the same issue. Today I started Traktor and it is working, but again, last week same thing happened, so I'm thinking that they same issue will arise next weekend.