If you simulate from the command line, you should see a warning that infinite or NaN (not-a-number) values occur during the simulation. (In R2021a you should also see these warnings in the SimBiology Model Analyzer app.)
This typically indicates a modeling error. I suggest decreasing the simulation time to something shorter and inspecting the results to make sure they make sense. I see that the value of "LacI mRNA" becomes negative after the first time step. And if I look at the reactions involving this species, the reactions rates don't look physically meaningful to me: "LacI mRNA" is consumed even when its concentration is 0.
