Backup to Dropbox not working

[arnor]

For the past six months, I have been experiencing issues backing up to Dropbox (a feature that previously worked perfectly). Due to various circumstances, I haven't used Locus much recently, though I did perform manual backups during that time. Now that a new version 4.36 has been released, I hoped the Dropbox backup function would start working again. Unfortunately, that wasn't the case; an "Oops" message appeared (see attachment). Is there a solution?