We updated local SP server with latest features packages(2016)
I have created SPFx webpart with yeoman(yo @microsoft/sharepoint) and able to deploy SPO, and hello-world webpart look fine.
But when I try to deploy same to local server, it not works there main reason of it looks "valid package" column of webpart is No (it was Yes in SPO)
There is a ps in official guide of sharepoint they say:
Note: The SharePoint Framework is currently in preview and is subject to change. SharePoint Framework client-side web parts are not currently supported for use in production environments
Is it reason ? SPFx RC works only in SPO not local server ? it doesnt make sense but couldnt resolve this issue