icloud account contact information not available
When I click on System Preferences>iCloud>Account details>Contact I get 'The contact information for this account is not available' and no way add or edit anything, there is only a grey screen with that message and a 'Done' button. Also, I'm not able to send text messages to my daughter's iPhone from my Mac Mini running OS 10.11.1. What is going on? It worked fine until last evening.
Mac mini, OS X El Capitan (10.11.1), 2.3 GHz Intel Core i5: 2 GB 1333 MH