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I have a notebook with my program. It works whit package FeynCalc. At the latter work with this document, I wrote the сode: 

$LoadPhi = True;
$Configuration = "ChPTVirtualPhotons2" ;
$Lagrangians = "ChPTVirtualPhotons2"[2]
"ChPTVirtualPhotons2"[4] ;
Get["HighEnergyPhysics'FeynCalc'"] ;
Lagrangian[ChPTVirtualPhotons2[2]]

And next to ran the programs, but my program keeps crashing. Now ".nb file" with my program does't launch and crash.

So, how may I remove last changes?

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  • $\begingroup$ you wrote Get["HighEnergyPhysics'FeynCalc'"] ; But should not that be the back tick there instead? try with back ticks, not the straight up tick for context, and see what happens. $\endgroup$
    – Nasser
    Jan 2, 2017 at 21:33
  • $\begingroup$ Maybe problem in this. But now I can not to open my program because of it crashes $\endgroup$
    – illuminato
    Jan 2, 2017 at 22:48

1 Answer 1

Reset to default
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After following the instrunctions here, e.g. by 

Import["https://raw.githubusercontent.com/FeynCalc/feyncalc/master/install.m"]
InstallFeynCalc[InstallFeynCalcDevelopmentVersion -> True]

and running 

$LoadPhi = True;
$Configuration = "ChPTVirtualPhotons2";
$Lagrangians = {ChPTVirtualPhotons2[2],
   ChPTVirtualPhotons2[4]};
Needs["FeynCalc`"]
Lagrangian[ChPTVirtualPhotons2[2]]

I get

enter image description here

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