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1. mysql8 unknown collation.
This error happens when you try to copy data from the version 8 to a previous DB version via the SQL file. The default collation for MySQL 8.0 is utf8mb4_unicode_ci. This collation is not supported by previous versions. Solution: Open the SQL file. Find "utf8mb4_unicode_ci" and replace it with "utf8mb4_unicode_ci".