Uploader says failed but upload is ok

[bearbate]

For the past few days I am getting a message:
An error occurred requesting /upload
Some error occurred. Please check the log.
However, on checking my Dropbox the upload has worked ok. Same error shows when doing mkdir but new dir is created.
This is being run on RPi 0 and has worked for 2 years ok until now. No updates applied to Pi recently.
Debug output attached.
Regards
error.txt

[kajan001]

I get this when I add -s option, to skip already existing files. Whenever it skips an already existing file it calls it an error.
No problem really, it still uploads the new files.
Are you running with the the -s option?