Mathematica Calculating traces with FeynCalc

Aleolomorfo

Summary
Evaluating a trace coming from a Feynman diagrams with the assumptions that all particles are massless
Hello everybody!

I need a little help with FeynCalc. I think the problem is really simple but I can't find how to fix it.
I want to evaluate a trace coming from a Feynman diagram. Since the particles are all massless, I want to impose the condition on the momentum $p^2=k^2=p'^2=0$.
I've attached the code in txt file.
I've tried everything I've found on the net(Simplify, Assumption, Refine, DotSimplify, DotSimplifyRelation, /. , ecc.)
Thank you in advance!

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