I found out that the find_folder function in the WP_Filesystem_Base class does not return a value when the root folder of the FTP path is the root location of the site. Therefor the error returned is “fs_no_folder”.
I fixed this my adding a folder within the root FTP location and moving the root location of the web. Then it all worked out.
I think this is a bug that must have come when I upgraded to 2.8.2.
plz fix this in future releases.