VAST-2.0-extensions-unknown-child
<Extensions> may only contain <Extension> elements
ErrorSchemaIAB VAST 2.0 §2VAST 2.0 and later (all versions)
`<Extensions>` is a container for `<Extension>` elements only.
How to fix
Wrap the element inside an <Extension type="custom"> block inside <Extensions>.
Check your VAST tag for
VAST-2.0-extensions-unknown-child and other issues instantly.Validate a tag →Other Schema rules
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