iPad (and iPhone) cannot connect to iMac network

In the past, I've been able to 'create network' and jin it on my iPhone and iPad. Now, I cannot connect either. It shows the wifi 'fan' as if it is connected, but it won't let me connect. Help!

And under network preferences, it says:
"Wi-Fi has the self assigned IP Address xxxxxxxxx and will not be able to connect to the Internet."

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