need some help cant get the shape brush to work.

so i was working my way trough mastering unreal technology Vo 1 level design book. when i BSP brush items stop loading materials and keep getting null error. so i try starting new project but the BSP are nor even loading the default material of checkered white and gray tills. in the map check there error level none and acror none message paths need to be rebuilt. and the bunch brush has null material references.