'Google Ad Manager : The VAST url always shows "aderror:1009 The VAST response document is empty"

I created an audio Ad Unit like this

audio ad unit

and I follow the steps to create the VAST url

step 1

step 2

step 3

then I get the VAST url

https://pubads.g.doubleclick.net/gampad/ads?iu=/22691391158/audio_12345&description_url=[url]&tfcd=0&npa=0&ad_type=audio_video&sz=1x1%7C400x300%7C640x480&gdfp_req=1&output=vast&unviewed_position_start=1&env=vp&impl=s&correlator=

VAST url

and I put the url to Video Suite Inspector, and It shows "Ad error: AdError 1009: The VAST response document is empty.".

https://developers.google.com/interactive-media-ads/docs/sdks/html5/client-side/vastinspector

video suite inspector

no ideas.



Solution 1:[1]

Have you created any line items and assigned that ad unit yet? I guess you're missing the line items setting in your ad manager.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 An Nguyen