error property
Error is why the sandbox could not come up, in plain words. Present only with status "error", and it is the field to read rather than inferring a cause from the absence of a pod.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? error;