How to solve UVM_FATAL issue?

In my simulation, I found the following UVM Report Summary.

--- UVM Report catcher Summary ---
Number of demoted UVM_FATAL reports  :    0
Number of demoted UVM_ERROR reports  :    0
Number of demoted UVM_WARNING reports:    0
Number of caught UVM_FATAL reports   :    0
Number of caught UVM_ERROR reports   :    0
Number of caught UVM_WARNING reports :    0

--- UVM Report Summary ---
Quit count :     0 of     1
** Report counts by severity
UVM_INFO :  688
UVM_WARNING :    0
UVM_ERROR :    0
UVM_FATAL :    1

Can anyone help me what UVM-FATAL is, how serious it is, and how this can be solved?

Thanks.