trouble with facebook page ID

Hi, I am getting this error message when adding the facebook ID I have for my client's facebook page ,"Cannot Display Feed. Pls check if the Facebook page exists or not."
I have tried several different facebook feed plugins, but it seems to be an issue with the id number specific to the page...any ideas on what could be causing this? I have clered the cache, but that didn't seem to help.
Thanks, Claire