Cant open my map after successful build lighting (fatal Error)

so this night i was finishing my personal project : cleaning delleting stuf (to optimize build lighting ) after i was done i didnt save and hit the build lighting (i did clic save while the build lighting were working ) wonder if that the case . anyway the build lighting was successful and when i woke up i save it and close it . Now Cant Open my map anymore i tryed many ting suggested on the Answerhub like trying to open backup (keep crashing ) clone it (keep crashing)

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Help ! D:

Solved by updating my unreal to 4.15