ru so queria fazer um mod mas esse erro n me deixa ser feliz 

java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
        at RFB-Launch//org.jetbrains.exposed.sql.SQLLogKt.<clinit>(SQLLog.kt:18) ~[SQLLogKt.class:?]
        at RFB-Launch//org.jetbrains.exposed.sql.Transaction.<init>(Transaction.kt:154) ~[Transaction.class:?]
        at RFB-Launch//org.jetbrains.exposed.sql.transactions.ThreadLocalTransactionManager.newTransaction(ThreadLocalTransactionManager.kt:102) ~[ThreadLocalTransactionManager.class:?]