Error 87 reading WebDav directory (The parameter is incorrect)

Hi,
I have lost of Directories on my cloud that I cannot read.
The message is: An error occured reading folder: The parameter is incorrect (87)
On my Synology NAS I do not have this problem, only in the (WebDav) Cloud.

Will you please help?

Best Regards,
Robert.

What happens if you go to the same path (make sure you copy & paste the exact same path) in File Explorer or other software? Do you get a similar error there?

Hi Leo,
IE does not work either, but WinDirStat and Cyberduck work fine. They can both open all directories. The problem is not with all the directories, but only some of them (about 20 out of 6700). When I go directly tot the files using their (Stack) web interface there is no problem. It is only when I want to read a directory with the Driveletter that I can give to my Stack.
I removed a faulty one from the Stack and uploaded all files again with SynBackPro (SFTP). This time everything worked fine for that directory. The directories are not extremely big (3.5 Gb). The guys from the Stack are also looking on it. There faces were also one big question mark (as mine).
There is no hurry, so have a happy Eastern to all of you.

Best Regards,
Robert