Build failed

Hi there, i tried to launch a small 2d game i created but i keep having BUILD FAILED problem
here is the log
im using UE 4.5
http://pastebin.com/KZ4Gbj1p

Hi masterx1,

Have you been able to reproduce this on a blank project with no additional content? Do you have any math expression nodes in your blueprints?

I don’t think it’s related to my blueprints since i tried to launch a blank project and also a complete project from the store & it has given me the same problem

Hi Masterx1,

Can you post your dxdiag here? Additionally what settings are you trying to use when attempting to build?

Here is my dxdiag, im not sure what do you mean by settings, if you mean the platform i want to build on its windows, if anything else be my guest, & explain to me since im just a beginner, with only few days of using UE4.5 link text

Solved i just needed to recompile UE4.sln