Crashing and close Game when launch

Hello to everyone, I’ve been working on a third-person game for many months and I tried to do a “launch” just as a test and see the result of my job and unfortunately at the fern of unreal compilation I report a crash "I attach the photo Of the crash below. " My game was made only in blueprint and with ue4 version 4.15. I can not understand this problem where it comes from and I’m really demoralized.

I thought maybe the problem is derived from some missing or deleted files that should be contained in the ue4 version 4.5 release.

I hope so much to be helped and to solve the problem, for as long ago I have been working on this project for a long time and I would be sorry to give up months and months of work.

Forgive my English, use google translate.

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I solved the problem.