I am using Ubuntu 16.04.2 LTS and Mathematica 18.104.22.168.
As suggested, I deleted the Feyncalc folder inside the Mathematica installation folder, tried to install again using the mentioned command
> InstallFeynCalc[InstallFeynCalcDevelopmentVersion -> True]
but still obtaining the same error message (as said, the evaluation is correct despite of the message).
Is it the code above for the installation correct? Maybe it is the Mathematica version, I will try to see if I could use a newer one in someone else's computer or Uni server.
Thanks for your help
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