VAST-2.0-root-version-value
VAST version attribute must be a recognised version string
WarningRequired fieldsIAB VAST 2.0 §2.1VAST 2.0 and later (all versions)
The `version` attribute value must be one of the officially released VAST versions: `2.0`, `2.0.1`, `3.0`, `4.0`, `4.1`, `4.2`, or `4.3`. An unrecognised value usually means a typo — for example `4` instead of `4.0`.
How to fix
Change the version attribute to a recognised value: 2.0, 2.0.1, 3.0, 4.0, 4.1, 4.2, or 4.3.
Invalid
<VAST version="4">Valid
<VAST version="4.0">Check your VAST tag for
VAST-2.0-root-version-value and other issues instantly.Validate a tag →Other Required fields rules
VAST-2.0-root-elementRoot element must be <VAST>VAST-2.0-root-version<VAST> must have a version attributeVAST-2.0-root-has-ad-or-error<VAST> must contain at least one <Ad> or <Error>VAST-4.0-wrapper-root-error<VAST> root contains both <Ad> and <Error> elements (invalid per VAST 4.0)VAST-2.0-ad-has-inline-or-wrapperEach <Ad> must contain exactly one <InLine> or <Wrapper>VAST-2.0-inline-adsystem<InLine> must contain <AdSystem>VAST-2.0-inline-adtitle<InLine> must contain <AdTitle>VAST-2.0-inline-impression<InLine> must contain at least one <Impression>