I am currently working on a fps game I just started lvl design whenever I add the navmesh bound volumeand try to play test my game it won't start any help?

I have added the landscape using the default settings and when I play test my game everything works fine buggy as soon as I add the nav mesh bounds volume and try to play test my game it freezes and won’t load. I have waited over a hour thinking maybe it’s just a long loading time but that doesn’t seem to be the case. There is no crash report because the engine doesn’t actually crash just freezes any ideas on how to fix this?