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java.lang.NullPointerException: 	at liquibase.diff.compare.DatabaseObjectComparatorFactory.isSameObject(DatabaseObjectComparatorFactory.java:91)	at liquibase.snapshot.DatabaseSnapshot.get(DatabaseSnapshot.java:180)	at liquibase.snapshot.SnapshotGeneratorFactory.createSnapshot(SnapshotGeneratorFactory.java:137)	at liquibase.snapshot.SnapshotGeneratorFactory.has(SnapshotGeneratorFactory.java:87)	at liquibase.snapshot.SnapshotGeneratorFactory.hasDatabaseChangeLogTable(SnapshotGeneratorFactory.java:160)	at liquibase.database.AbstractJdbcDatabase.hasDatabaseChangeLogTable(AbstractJdbcDatabase.java:726)	at liquibase.database.AbstractJdbcDatabase.getRanChangeSetList(AbstractJdbcDatabase.java:1127)	at liquibase.database.AbstractJdbcDatabase.checkDatabaseChangeLogTable(AbstractJdbcDatabase.java:695)	at liquibase.Liquibase.checkDatabaseChangeLogTable(Liquibase.java:602)	at liquibase.Liquibase.update(Liquibase.java:130)	at com.codahale.dropwizard.migrations.DbMigrateCommand.run(DbMigrateCommand.java:58)	at com.codahale.dropwizard.migrations.DbCommand.run(DbCommand.java:51)	at com.codahale.dropwizard.migrations.AbstractLiquibaseCommand.run(AbstractLiquibaseCommand.java:54)	at com.codahale.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:62)	at com.codahale.dropwizard.cli.Cli.run(Cli.java:69)	at com.codahale.dropwizard.Application.run(Application.java:72)	at com.example.helloworld.HelloWorldApplication.main(HelloWorldApplication.java:22)