It didn't find a steady state. This means your system takes too long to get to the steady state from simulation start.
A simple fix would be to switch to "Stored system state" in the Initialization tab of the simulation preferences. You must store a state where the system is in steady state. For example after a normal simulation.
Another possibility is to set the number of init cycles in the Analysis Tools dialog.
I strongly advise using the "Help" button in the Analysis Tools to get to the documentation. There you find:
[...]Number of init. cycles
The number of cycle-by-cycle simulations to be performed before the Newton iterations are started. When an analysis fails to converge because the starting point was too far from the steady-state solution, this parameter can help to get better starting conditions. The default is 0. [...]