I tried to build a new Webpart targeting SP16 FP2 & SP Online.
https://learn.microsoft.com/en-us/sharepoint/dev/spfx/web-parts/get-started/build-a-hello-world-web-part
When I deploy the Package to my SP16 the App does not show up on my other sites.
In my ULS logs i just have the following errors:
Unexpected Exception in SPDistributedCachePointerWrapper::InitializeDataCacheFactory for usage 'DistributedClientSideAppUpdateTimeCache' - Exception 'System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. at System.Collections.Concurrent.ConcurrentDictionary`2.get_Item(TKey key) at Microsoft.SharePoint.DistributedCaching.SPDistributedCachePointerWrapper.InitializeDataCacheFactory()'.
Any ideas what I'm doing wrong?