Error moving file

Hi.
I'm trying to move a file stored on a NAS in a shared folder to another shared folder on the same server using the MoveFile feature. I get the message:

Error moving file '/Folder1/FileName' to 'Folder2/FileName' rename: Invalid cross-device link.

What's wrong?
Thank you in advance for pointing out the error.

Usually, you can move a file only within the same file system/disk.
It seems that you try to move the file to a different file system/disk.