This generally happens because a numerical value, for example a load or an element length, is infinite or Nan (not a number). It is tricky to find out exactly what caused this issue, but here are some things you should try to troubleshoot the issue

check that non of the elements in your model have a very small lenght
check that the polars that you are using for your airfoils don't have unphysical properties (such as discontinuities)
if the error happens after the simulatio has started, add a Solver sensor and check the loads fields

It is also a good idea to simplify the model as much as possible so that it runs, and then add complexity until the error occurs. For example, if you have a bottom-fixed offshore wind turbine, you can try to

remove the RNA and run the simulation
disable the aerodynamic, gravity and hydrodynamic loads
run the simulation in loads only mode
run your model with the RNA only template