When the MQ server upgrade is performed from the previous version to the 9.1 version they will face the error as below in their application which uses MQ plugin activities version 7.7.0.
 
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  BWENGINE-100006 Load Error: ref=java.lang.NoSuchFieldError, class=com.tibco.plugin.bwmq.MqPutActivity
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BW 5.x,Webspehere MQ plugin 7.7.0 OS=All

1. Please make sure that the MQ server and the client jars are at 9.1 fixpack 3 or higher. Since this fix is done in the "IBM MQ fix pack 3 of the MQ 9.1" of the MQ server/client version. Below is the link which has the MQ 9.1 fix list.

Link:- https://www.ibm.com/support/pages/fix-list-ibm-mq-version-91-lts

2. In addition to that please install Websphere MQ plugin 7.7.0 hotfix-005.
   
The hotfix can be downloaded from the TIBCO download site. Please login to https://support.tibco.com and log in. Navigate to

Downloads>>hotfixes>>availableDownloads>>BusinessWorks>>Plugins>>Websphere_MQ>>7.7.0.

Please note that you need a valid user ID to access the download site.

When the user upgrades the MQ server version to MQ 9.1 then WMQ connection using WMQ plugin 7.7.0 fails with an error.