Applies to:
SharePoint On-Premises 2019
Description
This article lists the troubleshooting steps for various possible errors that might be encountered after converting classic UI to modern UI in SharePoint 2019.
Symptom 1:
“Create Pages” button in the NITRO Studio apps page failed.
Cause:
‘Site Pages’ feature is not activated in site features.
Resolution:
Activate the ‘Site Pages’ feature.
Navigate to Site Settings -> ‘Site Actions’ -> Click ‘Manage site features’ -> Click ‘Activate’ option present adjacent to ‘Site Pages’.
Once the feature has been successfully activated, the ‘Active’ button will be highlighted as shown below:

Note: If some pages were created during earlier attempts when the error was noticed, then those pages should be deleted before clicking “Create Pages” button again.