You would get that error if the sqlite file from the following path is missing (maybe deleted since the server started), "Environment.SpecialFolder.CommonApplicationData"\Laserfiche\Mobile\TraceLog.sqlite

The value of Environment.SpecialFolder.CommonApplicationData depends on the version of your Windows, for example in Windows10 it's "C:\ProgramData".

You can try restarting the mobile app pool or reset IIS and the server would attempt to re-create it. It could also be a permissions issue, like the mobile app pool doesn't have rights to create a file in that folder. You can try working around that by creating an empty file with that name in that folder or granting rights or running the service as a different account.

However this is best handled professionally through support so please open a case if none the above tips work.