Handling Errors

There are three types of errors.

Validation errors: These errors occur during the validation process.
- Example: An operation configuration with an account that doesn’t exist.
Preview errors: These errors occur during the preview process.
- Example: A conversion operation with an amount too small to convert.
Execution errors: These errors are the same as preview errors but are received after execution.

Errors appear as an integral part of the operation if one of the processes below fails to complete:

Process	Phase	Error Type	Error Location in Schema
Configuration validation	During WFC creation process	Validation error	`configOperations[n].validationsFailure`
Execution validation process	During WFE creation process	Validation error	`executionOperations[n].validationsFailure`
Execution preview process	During WFE creation process	Preview error	`executionOperations[n].preview.failure`
Execution process	After launching the WF	Execution error	`executionOperations[n].execution.failure`

The error schema is constant. Both validation and execution errors are composed of reason (which is a closed set of possible error reasons) and data (which, in most cases, is an open object that might contain additional error data).