SystemJS issue

aurelia.json

{
  "name": "app.fivb.org",
  "type": "project:application",
  "platform": {
    "id": "web",
    "displayName": "Web",
    "output": "scripts",
    "index": "index.html",
    "baseDir": "."
  },
  "transpiler": {
    "id": "typescript",
    "displayName": "TypeScript",
    "fileExtension": ".ts",
    "dtsSource": [
      "./custom_typings/**/*.d.ts"
    ],
    "source": "src/**/*.ts"
  },
  "markupProcessor": {
    "id": "maximum",
    "displayName": "Maximum Minification",
    "fileExtension": ".html",
    "source": "src/**/*.html"
  },
  "cssProcessor": {
    "id": "sass",
    "displayName": "Sass",
    "fileExtension": ".scss",
    "source": "src/**/*.scss"
  },
  "editor": {
    "id": "atom",
    "displayName": "Atom"
  },
  "unitTestRunner": {
    "id": "karma",
    "displayName": "Karma",
    "source": "test/unit/**/*.ts"
  },
  "paths": {
    "root": "src",
    "resources": "resources",
    "elements": "resources/elements",
    "attributes": "resources/attributes",
    "valueConverters": "resources/value-converters",
    "bindingBehaviors": "resources/binding-behaviors"
  },
  "testFramework": {
    "id": "jasmine",
    "displayName": "Jasmine"
  },
  "build": {
    "targets": [
      {
        "id": "web",
        "displayName": "Web",
        "output": "scripts",
        "index": "index.html",
        "baseDir": "."
      }
    ],
    "loader": {
      "type": "system",
      "configTarget": "vendor-bundle.js",
      "includeBundleMetadataInConfig": "auto",
      "plugins": [
        {
          "name": "text",
          "extensions": [
            ".html",
            ".css"
          ],
          "stub": true
        }
      ]
    },
    "options": {
      "minify": "stage & prod",
      "sourcemaps": "dev & stage"
    },
    "bundles": [
      {
        "name": "app-bundle.js",
        "source": [
          "[**/*.js]",
          "**/*.{css,html}"
        ]
      },
      {
        "name": "vendor-bundle.js",
        "prepend": [
          "node_modules/bluebird/js/browser/bluebird.core.js",
          "node_modules/aurelia-cli/lib/resources/scripts/configure-bluebird.js",
          "node_modules/systemjs/dist/system.js"
        ],
        "dependencies": [
          "aurelia-binding",
          "aurelia-bootstrapper",
          "aurelia-dependency-injection",
          "aurelia-event-aggregator",
          "aurelia-framework",
          "aurelia-history",
          "aurelia-history-browser",
          "aurelia-loader",
          "aurelia-loader-default",
          "aurelia-logging",
          "aurelia-logging-console",
          "aurelia-metadata",
          "aurelia-pal",
          "aurelia-pal-browser",
          "aurelia-path",
          "aurelia-polyfills",
          "aurelia-route-recognizer",
          "aurelia-router",
          "aurelia-task-queue",
          "aurelia-templating",
          "aurelia-templating-binding",
          {
            "name": "text",
            "path": "../node_modules/systemjs-plugin-text",
            "main": "text"
          },
          {
            "name": "aurelia-templating-resources",
            "path": "../node_modules/aurelia-templating-resources/dist/amd",
            "main": "aurelia-templating-resources"
          },
          {
            "name": "aurelia-templating-router",
            "path": "../node_modules/aurelia-templating-router/dist/amd",
            "main": "aurelia-templating-router"
          },
          {
            "name": "aurelia-testing",
            "path": "../node_modules/aurelia-testing/dist/amd",
            "main": "aurelia-testing",
            "env": "dev"
          },
          {
            "name": "@fivb/sdk",
            "path": "../node_modules/@fivb/sdk/dist/commonjs",
            "main": "index"
          },
          {
            "name": "axios",
            "path": "../node_modules/axios/dist",
            "main": "axios"
          },
          {
            "name": "i18next",
            "path": "../node_modules/i18next/dist/umd",
            "main": "i18next"
          },
          {
            "name": "aurelia-i18n",
            "path": "../node_modules/aurelia-i18n/dist/amd",
            "main": "aurelia-i18n"
          },
          {
            "name": "i18next-xhr-backend",
            "path": "../node_modules/i18next-xhr-backend/dist/umd",
            "main": "i18nextXHRBackend"
          }
        ]
      }
    ]
  }
}