UNMET PEER DEPENDENCY onsenui@2.8.3

[ethan2018]

• core-js@2.4.1 node_modules\onsenui\node_modules\core-js
  onsen-app@0.0.0 F:\VC Projects\Onsen\onsenApp
  ±- ngx-onsenui@4.1.0
  **`-- UNMET PEER DEPENDENCY onsenui@2.8.3
  **
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules\chokidar\node_modules\fsevents):
  npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {“os”:“darwin”,“arch”:“any”} (current: {“os”:“win32”,“arch”:“x64”})
  npm WARN @schematics/angular@0.0.49 requires a peer of @angular-devkit/schematics@0.0.34 but none was installed.
  npm WARN @schematics/schematics@0.0.10 requires a peer of @angular-devkit/schematics@0.0.40 but none was installed.
  npm WARN ngx-onsenui@4.1.0 requires a peer of onsenui@~2.5.3 but none was installed.