Uninformative error message when instrument/dut driver is not configured

I have a result listener which requires 2 drivers. If there is not suitable driver(s) added into tap and plan is runned, error message that I get is "value cannot be null" and trace source is TestPlan. Error gives very little info for the end user to found out what is actually missing. Adding rule for the drivers helps a bit, it shows red icon when one opens the result listener. For test steps, failing rules are more obvious as they are shown in the test plan panel. But I have found out end users rarely look into result listeners settings so they will not find the red icon either.

Any way of getting more specific error message, which driver is not satisfied and why?

I am using Tap 9.7