You may meet this error on home directory.

% npm uninstall appium
npm WARN uninstall not installed in /Users/hrt0kmt/node_modules: "appium"

You must uninstall npm package on directory which contains same node_modules.

% cd /Users/hrt0kmt/.nodebrew/node/v0.12.7/lib
dtrace
node_modules

% sudo npm uninstall appium
Password:
unbuild appium@1.4.10

Success !!

npm WARN uninstall not installed in /Users/hrt0kmt/node_modules: "xxx"

原文：http://www.cnblogs.com/melody-emma/p/4763742.html