You are using SharePoint 2019 On-Premise environment and trying to add the ShortPoint SPFx app to your Site Contents. Once you are selecting ShortPoint SPFx to add you receive an error:

An unexpected error has occurred.
Correlation ID: 2140719f-785a-30dc-714d-e089e152a2cd


You are logged in using a System account. SharePoint policy does not allow adding apps using the System account.


Please, log in with a non-System Admin Account and make sure that that account is the site collection admin.

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