Also have a look here 7.8 Error Messages.
|com.advendio.mediacloud.adServer.adswizz.restServices.utils.AdsWizzException: 400 - constraint.violated: The request entity had the following errors: (Errors: constraint.ad.targeting.zones.empty: Zones may not be empty (zoneIds); )||There are no Zones defined for the Item you are trying to submit|
Please define, which Zones should be used for the Item.
You can do this by connecting Zones to the Ad Spec: 3.2.1 Create Ad Spec, Ad Price, and link to AdServer
Or via Inventory Targeting on the Campaign Item: 184.108.40.206 Inventory Targeting
Afterwards, try to submit the Item to AdsWizz again