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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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R1 (10.0.0.1) has changed its area ID from 0 to 1, and it can no longer form a neighbor relationship with R2 (10.0.0.2), which is located in the backbone area. All OSPF areas must be connected (physically or virtually) to the backbone area (area 0).
OBVIO...
the error mentions area many times so this is the big clue here