In order to develop new client-side web parts using the SharePoint Framework (SPFx) preview, you will need the following correctly setup:

  1. An Office 365 Developer Tenant (note that it must be a developer tenant via the Office Dev Program)
  2. A working App Catalog site in your tenant
  3. A developer site collection
  4. An uploaded workbench.aspx file to the library
  5. A site column in your “Documents” document library called “ClientSideApplicationId

If you try to browse to your site (i.e. and miss or forget step #5 , you will get the following error:

something went wrong

‘ClientSideApplicationId’ does not exists in list or list item

All of these instructions can be found here.

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