The “Unable to create DATABASECHANGELOG in Cassandra” error typically occurs due to permission issues, incorrect keyspace configurations, or schema mismatches between the migration tool (e.g., Liquibase) and Cassandra. It can also arise from using incompatible versions of Cassandra and the migration tool. To resolve this, ensure proper permissions, verify the correct keyspace is being used, and check for compatibility between the tool and Cassandra.