I have this big issue with crashing

i have this big issue with crashing
i made a BP for character and weapon and UMG and interface BP they talk to each ather
then i got crashing when i try open the editor i moved the crashing BP witch is the chracter one so all referenses will brake . and by than i can open the project and re casting the BP and its crash when i try to reOpen every time
then i deside to make a fresh BP for character and i did and i can play normaly then when i try open the project its crash … this is the report …

i open a copy by 4.7 preview 8
it seams the problem fixed (but i cant work with preview version any way)