[SOLVED] Destructible mesh-can't even fracture mesh? and after that can't fracture any other mesh?!

I know it is already solved. but I want to add something. If you can’t see your fractured mesh then in your destructible mesh on the top centre left, there is “Preview Depth 0” Selector. so Click on it and change it to “Preview Depth 1”. It should show you destructible mesh.