Repository: SharePoint/sp-dev-docs

Issue #3490: Not able to deploy SPFx webpart in Sharepoint 2019 onprem
Created: 2019-02-25T03:15:00Z
Hi All,
I have setup SharePoint 2019 on-prem and getting the below error when I am trying to deploy SPFx webpart control as part of the catalog:
There were errors when validating the App manifest.: Xml Validation Exception: 'The 'IsClientSideSolution' attribute is not declared.' on line '1', position '249'., Xml Validation Exception: 'The element 'Properties' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest' has incomplete content. List of possible elements expected: 'StartPage' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest'.' on line '1', position '338'., Xml Validation Exception: 'The element 'App' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest' has incomplete content. List of possible elements expected: 'AppPrincipal' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest'.' on line '1', position '351'.
When I search over the internet I see the same issue in SP2016 but nothing with SP19.
I have also installed all the updates provided in the below link:
https://docs.microsoft.com/en-us/officeupdates/sharepoint-updates
Request you to help me with the solution.
Thank you for your support in advance.
Note: The same solution is working seamlessly in SPO.
Regards,
Krishna.Vandanapu

Duplicate issue #3469: .sppkg support in App Catalog fails in SharePoint 2019
Created: 2019-02-19T09:04:47Z
Category

 Question
 Typo
 Bug
 Additional article idea

Steps to Reproduce
I created an App Catalog and I created the solution follow the steps of the next link https://docs.microsoft.com/en-us/sharepoint/dev/spfx/web-parts/get-started/build-a-hello-world-web-part
When generating the package it does not generate any errors but when I upload it to the App Catalog library it gives me the following errors:
There were errors when validating the App manifest.: Xml Validation Exception: 'The 'IsClientSideSolution' attribute is not declared.' on line '1', position '256'., Xml Validation Exception: 'The element 'Properties' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest' has incomplete content. List of possible elements expected: 'StartPage' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest'.' on line '1', position '352'., Xml Validation Exception: 'The element 'App' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest' has incomplete content. List of possible elements expected: 'AppPrincipal' in namespace 'http://schemas.microsoft.com/sharepoint/2012/app/manifest'.' on line '1', position '365'.
The point is that AppManifest.xml that is generated contains "IsClientSideSolution" and this atribute is not declareted in any place in the project. What is worng in the packaging process using gulp in on premise SharePoint 2019? Also 'StartPage' and 'AppPrincipal' tags are not included in the manifest, I create a new one by hand and I could upload the app, but is not the properly way.
Can someone help me? Thanks a lot.

Closing comment (2019-03-01T19:09:19Z): For issue maintenance - Duplicate of #3490