Cordova plugin error: "Uncaught module ... already defined"

To expand on the 2 above answers. Deleting the www folder & platforms/browser -if running on browser. Then running ionic cordova prepare browser built all files again correctly.

Just to expand on akiraspeirs answer. The 'example-plugin.js' file is located in the Android folder under Assets/www/plugins/example-plugin/example-plugin.js

This error occurred because I copy-pasted code from the generated 'example-plugin.js' back into the original plugin file.

When I added the plugin again, the generated code then got wrapped twice like this:

cordova.define("com.example.example-plugin", function(require, exports, module) { cordova.define("com.example.example-plugin", function(require, exports, module) { var exec = require('cordova/exec');

Removing the generated bits from the original example-plugin.js file fixed this.