When you do an Oracle Export/Import (and some other operations) the Oracle Queues will become disabled. In this state the application can’t enqueue or dequeue messages from it. If the application tries to do those operation it will end up with an Oracle Exception.
If you see these errors you would need to go to IFS Solution Manager -> Monitoring ->Oracle Queues -> Oracle Queues and start the queue mentioned in the error message
See LCS Solution 275872