Error 9513 occurs while validating the MSIX/Appx manifest xml.
Building a release is when validating schema in [File Name ([Line number)].
This build error may be caused while validating the MSIX/Appx manifest xml against the schema files.
To workaround the issue at this point,
Refer https://docs.microsoft.com/en-us/uwp/schemas/ to compose the manifest entries, like the mandatory and supported values.
You are required to correct the values in the corresponding views in the MSIX project.
For example, recheck the values specified for the added declaration and check whether the values are as per the schema or not.
How Do I modify Manifest xml file?