"unable to charge"
I had an old Motorola V3, which used to show me that error.
It could result if the charger is not firmly connected to the phone. To diagnose this, try borrowing someone's moto charger.
It's also possible that battery contacts could have dust. Try dusting them off so that they're nice and shinny as usual.
Finally, try removing the battery for a few minutes, reinsert and charge, leave the phone off when you charge.
The phone usually starts working after the regimen. If the problem persists, you'd know which method worked and what failed, so you can press for a warranty.
Cheers
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