I have a problem implementing my share-point SPfx app to the share-point site of my organisation.

I followed the instructions provided by microsoft at https://docs.microsoft.com/en-us/sharepoint/dev/spfx/web-parts/get-started/hosting-webpart-from-office-365-cdn yet when I add my App to the sharepoint I get an implementation error.

This is the message I get: My sharepoint website is in Dutch Headers translated from dutch to english from left to right:

Enabled, Valid app-package, Implemented, Error message with App-package

Any Idea what could be going wrong?

The step I used to create my .sppkg file were:

  1. gulp bundle --ship
  2. gulp package-solution --ship
  3. Then I uploaded the .sppkg to the App Catalog and I get the error

The other thing I noticed is when I run a development build by neglecting --ship from the build and package-solution I get no error. So I think there might be something wrongly configured in the SharePoint site or I am configuring my application the wrong way.

If anymore information is need please let me know how to resolve this error "3cd06c9e-6015-6000-b78b-ead6a160cb77"

  • can you go to config > package-solution.json file and then increase the version number to and upload the app again and check ? Jun 1, 2018 at 12:59
  • I did as you ask by increasing the version number and reproducing the build steps I defined in my post but I still get the Error message with the package.
    – Tim Smeets
    Jun 1, 2018 at 13:04
  • are there any errors in gulp serve ? Also, try the below steps 1) gulp clean 2) gulp build 3) gulp bundle --ship 4) gulp package-solution --ship Jun 1, 2018 at 13:12
  • After looking a bit further I noticed I was now able to add the custom app on a modern page. But I get a SPLoaderError. It seems to be looking for the en-US version of the Strings file, yet in my source-code I have put in a nl-nl.js file so it will look for the dutch version of strings. Yet it tries to load the en-US version.
    – Tim Smeets
    Jun 1, 2018 at 13:24
  • Error: ` [SPLoaderError.loadComponentError]: Laden van onderdeel da1dd1e0-1015-4823-8c58-bb82fd0eb852 (KwaliteitWebPart) is mislukt. Oorspronkelijke fout: Laden van URL publiccdn.sharepointonline.com/<website>/sites/…`
    – Tim Smeets
    Jun 1, 2018 at 13:26

1 Answer 1


This looks to be an issue related to webpart localization.

In your nl-nl.js file, ensure that you have added the entries that exactly match the mystrings.d.ts interface entries.

Also, to debug your code, you can change the file ./config/write-manifests.json to:

 "cdnBasePath": "<!-- PATH TO CDN -->",
 "debugLocale": "nl-nl"

The MS official documentation provides a great reference to implement localization.

Reference - Localize SharePoint Framework client-side web parts

Please implement the necessary changes as mentioned in the above link. SharePoint will automatically show the localized values based on the currentUICulture value.

  • Thank you, I will be reading trough the documentation, I will update as i go.
    – Tim Smeets
    Jun 1, 2018 at 14:02

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