Failed to Delete Directory Error

I have a 4 TB My Cloud Drive connected to my MacBook Pro running the latest OS.  I have a share on My Cloud that is Not Public and I have uploaded to that share a folder that contains Mac Applications.  Now I want to delete those Applications but I am getting a Failed to delete directory error.  I also had PDF files in the folder but those delted just fine.  In fact I want to dlete the whole folder of Apps.  Any idea on how to override this error without resorting to drastic measures such as reformatting the cloud?  It could be permission problems but I am not savy on how to use the SSH capability.  Any help would be greatly appreciated.  Thank you.

The folder could still be in use by your apps. Rebooting mycloud might help…