Chamsys to Unreal Engine crashing problème 4-20, 4-21,

Hey guys this is a special problème i’ve got here.

I’m trying to use UE4 as a previs tool with the DMX plugin to be controlled via art-net by another programme called Chamsys, but after i did all the patching, pressed play and pressed on the button to turn on the lights i get a ‘‘Assertion failed’’ message.

What is it and how do i fix it?