UE4 crashes when trying to build

hi everyone,

recently I started working in UE4 (on OSX sierra) as an artist and stumbled upon a bug that I do not know how to solve myself.

every time I try to do a complete build (only building lighting works just fine), unreal crashes. I did copy the crash report in hopes someone is kind enough to help me out as quick as possible (as I am working on an school exam right now).

i made a screenshot of the crashreport info.

update: after trying to build everything separately I came to the conclusion that (I think) the the problem occurs when building the texture stream. I already reimported all my files into the project, this did not solve anything.

Hello,

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Thanks