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Helpful answers
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Oct 14, 2015 3:52 PM in response to Daily_llamaby Daily_llama,Well, that was like watching grass grow. Never mind. I’ve switched to Google Handouts and it works fine.
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Jul 26, 2016 1:25 PM in response to Daily_llamaby Lori in the hills,Same problem here.
I just imported my contacts into a new Macbook Pro, from a previous Macbook. (In ".abbu" format, via USB stick. Both computers running OS 10.11.5). Then tried to send messages using "Messages" app. I can send messages to some contacts, but for others I get the "is not registered with iMessages" error. This is happening with a contact that I used frequently to communicate with through Messages and FaceTime on my old computer. There's no way she's not registered, I know she uses Messages all the time.
I don't have these contacts synced with a phone, tablet, or anything else, I've only ever used them on the computer, for Messages and FaceTime.
Any help greatly appreciated!
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Jul 27, 2016 10:03 AM in response to Lori in the hillsby Eric Root,If the below doesn't fix your problem, you might want to start your own post since this one is from last year. A new post would be much more visible. You can link to this one.
Might be a corrupt .plist.
Do a backup, preferably 2 backups on 2 separate drives.
Quit the application.
Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Select Library. Then go to Preferences/com.apple.iChat.plist. Move the .plist to your desktop.
Restart the computer, open the application and test. If it works okay, delete the plist from the desktop.
If the application is the same, return the .plist to where you got it from, overwriting the newer one.
If that doesn’t work, repeat the above but delete the com.apple.imagent.plist
Thanks to leonie and Ralph Johns (UK) for some information contained in this.