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I performed a runtime upgrade on the chain, but due to a migration failure, the chain stopped producing blocks. The logs only show that the migration failed.

When I attempt to restart the validators, they do not start producing blocks. Instead, they continue to display block data with the migration error.

How can I fix this issue?

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I believe you should label that block as a bad block in the chain spec file, you can check Kusama's chain spec file for an example. Clear the validators' database and resynchronize to the previous block. This is a "hard fork" I think.

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