Changing Channel Permissions

[محروم.كوم]

Ok so everything is running smoothly however when i get to the Channel Permissions i stumble across a problem..


When "Denying all" i get:
That action could not be completed. Please try again, and if this occurs again please contact the system administrator and tell them how you got this message.

I get the same error when trying to copy permissions from another Channel. However editing them individually seems to be ok.

Any suggestions? __DEFINE_LIKE_SHARE__