Error when synchronising from B to A

[FVG]

I have a synchronization batch between a desktop (A) and a laptop (B).
When synchronising from A to B everything is OK.
When synchronising from B to A I regullary become an error message when a file is newer on B.
The message (translated from Dutch) is "the trash is not available for the following folders..." and the files are not synchronized.
Both A and B have Windows 10 and are cabled on the same network.
What's the problem?
Thanks
Frank

[Plerry]

I assume "trash" stand for the Recycle-bin.
If so, it seems for Synchronization Settings (F8) you selected the
Recycle-bin for the Delete Files method.
And apparently the recycle-bin on the desktop (A) is not available for
some of the destination folders on (A) to move the previous file version to.

If you do not care about retaining the previous version, you might select the Permanent method for Delete Files.
If you do care about retaining the previous version, you might select the Versioning method

[FVG]

Thanks, this is working.