[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [INestedError](./rc-js-util.inestederror.md) > [composeErrorMessages](./rc-js-util.inestederror.composeerrormessages.md) ## INestedError.composeErrorMessages() method Create a localized error message that describes what went wrong, and includes some minimal technical detail that's likely to describe the root cause. **Signature:** ```typescript composeErrorMessages(): IErrorSummary; ``` **Returns:** [IErrorSummary](./rc-js-util.ierrorsummary.md)<TLocalization>