Hi Sreenivas,
From the error log, we could say that there is some issue with the class file. Can you cross check whether the relevant class has been loaded in to PI correctly or not.
Also, refer the below blog which might help you.
IBM MQ (5.3, 6.0, 7.0) Interoperability with PI
1138877 - How to Deploy External Drivers JDBC/JMS Adapters
SAP note 1751177 PI JMS adapter with MQ client library 7.1 and 7.5