VAST Error 600: General CompanionAds error

The player encountered a general CompanionAds error. In operations, this usually shows up when companion rendering or resource handling failed without a narrower companion code.

This is the kind of issue that is easiest to solve when the investigation starts from the right evidence path. VAST Inspector is usually the fastest first step because it confirms whether the response, wrapper chain, or media selection behaves the way the player expects.

Companion failures matter operationally because they often affect revenue quality, viewability, and campaign acceptance even when the main video ad plays.

The most common causes are companion rendering issues, unsupported resource types, and layout constraints or missing companions. Teams often treat the visible error as the root problem, but in practice the real issue may sit earlier in the wrapper path, in the creative package, or in the environment assumptions around the request.

That is why it helps to compare a failing request against a known-good example. Once you know whether the difference is structural, timing-related, or environment-specific, escalation becomes much faster and cleaner.

VAST Inspector should be the first stop for this class of issue. From there, move into VAST Error Code Explainer to narrow the failure further.

A useful investigation should end with concrete evidence: the failing tag or asset, the exact point where the player behavior diverged, and the partner or configuration change most likely responsible. That turns a generic player code into an actionable support ticket or launch fix.

Inspect the companion nodes, compare them against the available display area, and determine whether the issue is resource, layout, or requirement-related.