什么是＆＃34; / usr / local / bin / gc＆＃34;当我升级graphcool客户端时，为什么会抛出错误？

Question

npm update -g graphcool

我从v 0.5升级到最新的graphcool客户端，我收到以下错误

npm ERR! path /usr/local/bin/gc
npm ERR! code EEXIST
npm ERR! Refusing to delete /usr/local/bin/gc: is outside /usr/local/lib/node_modules/graphcool and not a link
npm ERR! File exists: /usr/local/bin/gc
npm ERR! Move it away, and try again.

什么是/ usr / local / bin / gc，我应该像它要求的那样删除它吗？