Sometimes the Online Logs did not recognize or accept a Callsign. It says OK on the upload but for some unknown reasons its not in their Database. Or the Online Log is offline. It happens for me sometimes with Clublog and HRDLog. If you made now changes in your Log (EQSL Upload f.e.) and you go online again, cqrlog first tries to delete the changed Callsign. But if it is not in the Online Log Database, you got that Error.
The only way for now to correct that Error is to upload manually a Adif Export with the missing Callsigns from cqrlog to the Online Logs via their Web Interfaces.
The bad thing is, if their is a missing Callsign in one Online Log, cqrlog stops uploading Callsigns to that specific Online Log. So if you have more than one missing Callsign in that Log, you have to repeat the whole procedure of checking, exporting Adif, importing to the Online Log over and over again until the last missing Callsign is in the Online Log. Or importing your whole Adif to the Online Log with a lot of Dupe checking in their Database. I am not a Friend of that way. And one Point more. The Online Logs needs some time to import and update their Database. So you have to wait several minutes before the Error is gone.

I wish, cqrlog would not stopp uploading after a missing Callsign. Instead of stopping, a Upload-Error.log in the Users Home Directory would be fine. So we can see, which Callsigns are missing in which Log and we can upload them in one way instead of one by one.

73 de Heinz-Juergen DO1YHJ