when rm phonegap-facebook-plugin say "Path must be a string. Received undefined"

[niezw]

cordova version: v5.4.0
node version:6.9.5

[niezw]

I fix this problem
1.rm -rf your_project/plugin/phonegap-facebook-plugin
2.delete 'phonegap-facebook-plugin' settings of the plugin/ios.json and plugin/fetch.json
3.rm -rf yout_project/platforms/ios/yout_appname/plugins/phonegap-facebook-plugin
4.to add phonegap-facebook-plugin