The upload failed: Session key not set error

Hey, I keep having this error when I try upload to my file manager.
Is there anyway I could fix this?

Use a real file transfer application instead of a webpage.

Can’t my ISP blocks the port 21 so I have to

SFTP runs on port 22.

I got this error when I tried to upload multiple files. When I then tried a single file, the upload worked. Or just try again a couple of minutes later.

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