VAST-2.0-text-only-element
Text-only element contains a child element
ErrorSchemaIAB VAST 2.0 §2VAST 2.0 and later (all versions)
Elements like `<AdTitle>`, `<AdSystem>`, `<Duration>`, and `<Impression>` are defined in the VAST schema as text-only (they may only contain text or CDATA, not child elements). A child element inside one is a schema violation.
How to fix
Remove the child element — text-only elements such as <AdTitle>, <Duration>, and <Impression> accept only text or CDATA content.
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