You should lern how to do a FEM analysis first before you gone try to start with a complicated geometry.
And even try to calculate the result with pen and paper ( takes less than a minute for the cantilever example ... )
Than I would make simpler modell. Delete anything you do not need. Close the holes if they do not have an impact on your analysis etc.
No, the geometry has some problems and thus the mesher breaks during volume meshing. On this complex geometry it is difficault to say where exact the problem is. One needs to see the mesher log. How long have you been waiting, for meshing, an hour?