Just reinstall FeynCalc using the automatic installer

I tried my past feyncalc code, and I find that MMA 14.2 and 14.3 versions will crash as running some codes, but it is all good on MMA 14.1 version. I think MMA might change its kernel design in 14.2 and 14.3 versions but resulting in some kernel bugs. So I think it is better to use Mathematica 14.1 or older version.

I reported this bug to WRI [CASE:5291783] but there's not much more I can do about it.

I pushed a fix to the repository, but there's no guarantee that there are no other kernel bugs that will trigger similar crashes.

Thank you so much @vsht . I reinstalled the development version. Now its working fine.

I tried my past feyncalc code, and I find that MMA 14.2 and 14.3 versions will crash as running some codes, but it is all good on MMA 14.1 version. I think MMA might change its kernel design in 14.2 and 14.3 versions but resulting in some kernel bugs. So I think it is better to use Mathematica 14.1 or older version.

Yes, I used older version of Mathematica. It worked fine there also. After the fix by @vsht , Both 14.3 and 14.1 are working fine and producing the same output. Thank you 8-).