The operation can’t be completed because you don’t have the necessary permission

“The operation can’t be completed because you don’t have the necessary permission.” Getting this dreaded message randomly appear. Sometimes my WD Elements 10TB works in connecting via my network to my Mac 10.14.6, and sometimes this bloody message comes up. I have no idea what to do to stop this from occuring, nor do I have any idea of why it occurs or when it’ll pop up. Anyone come up with a solution?

The message comes when you access some files? May be a file on the network is in use or permissions are restricted.