The message is not really helpful to understand what has happened. It is generated here

In my case cause has no message property, but in has error property which I think conforms with docker spec here if you look at the example.

At the same time there is an error section that states it should be a 'message' field.

Would it be possible to support both 'message' and 'error' fields? With 'message' being the first choice, 'error' the second and the cause itself for a backup.

 (cause.message || cause.error || cause)