WTAE Channel 1197

When I go to channel 1197-WTAE Channel 4 Pittsburgh I’m getting this message….”

”Comcast is required by law to black-out the program currently airing on this channel.” Please consult your on-screen guide or www.xfinity.com For alternate program listing as this program is available on another local station in your area.”

Why am I getting this message!    I’ve always been able to watch this channel.   I haven’t changed anything on my package.     
Thanks!