Cannot set property 'exports' of undefined #12

System.config({
  baseURL: "/assets",
  defaultJSExtensions: true,
  transpiler: "babel",
  babelOptions: {
    "optional": [
      "runtime"
    ],
    "blacklist": []
  },
  paths: {
    "github:*": "jspm_packages/github/*",
    "npm:*": "jspm_packages/npm/*"
  },

  packages: {
    "/assets/js/components": {
      "defaultExtension": false,
      "main": "/assets/js/components/ReactApp.jsx",
      "meta": {
        "*.jsx": {
          "loader": "jsx"
        }
      }
    }
  },

map: {

// ...

"jsx": "github:floatdrop/plugin-jsx@0.13-rc",

// ...

"github:floatdrop/plugin-jsx@0.13-rc": {
    "react-tools": "npm:react-tools@0.13.0-rc2"
}