I was getting this â€œcould not move because the target channel is hiddenâ€ error all of a sudden in photoshop when I tried to move layers around.
How to fix it:
On your layers panel switch to the â€œchannelsâ€ tabâ€¦ you should see a â€œquick maskâ€ channel on the bottomâ€¦. throw that layer into the trash can ( by dragging and dropping it in there ) .
That fixed it for me.