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install -g truffle-security

when I install truffle-security using the command npm install -g truffle-security
I get this error
npm ERR! code 128
npm ERR! Command failed: git checkout HEAD
npm ERR! fatal: unknown style ‘deff3’ given for ‘merge.conflictstyle’
npm ERR!
thanks for any reply

It looks like an error in your git settings. You probably have deff3 instead of diff3 for merge.conflictstyle.

git config --get merge.conflictstyle