Editor Stuck At 45%

Hi, I am an armature in Unreal Engine 4. I have made 2 successful games. One day, as I started up the editor, it got stuck at 45% and said “initializing.” I have looked at many posts. I am on a Linux machine, and I cannot find out if the shaders are compiling. I have deleted my derived data cache folder, but no luck. Another thing is that serialization error action needed keeps up coming up. It comes up twice at the exact moment. Please help. Thanks!