The field in the request that caused this error. This may be a path, separated by periods in the case of nested fields. In some cases this may come back as null if the error is not specific to any single element of the request.

What happened to cause this error. In most cases, this can be fixed immediately by changing the data you sent in the request, but in some cases you will be instructed to Open a support ticket or perform some other action before you can complete the request successfully.