How you realized the error occur? Please check the broker server log files that located in webMethods/Portal/broker/logs to get the information.
You also can start the broker server in debug mode. To do so, start the Broker Server from the command-line prompt using the following command: <webMethods_install_directory>/Broker/bin/awbroker –d <full_path_of_BrokerServer_data_directory> -blah
Example:
/opt/webMethods/Broker/bin/awbroker –d /var/opt/webMethods/awbrokers71/default -blah
#broker#Integration-Server-and-ESB#Universal-Messaging-Broker#webMethods