The messages application does not open on iMac

I'm on an iMac, retina Yosemite, 10.10.5 running.   When I try to open the messaging app, I get a screen empty, as shown below.  Also, I noticed that my iMac is not visible to my iPhone in "Text Message Forwarding", if it is an additional clue to what is wrong. Until yesterday, everything worked well. To my knowledge, I did not update any software in the last two days.

Restart your computer.

Tags: Mac OS & System Software

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