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title: APIkit 4.0.1 Release Notes
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# APIkit 4.0.1 Release Notes

**March 20, 2018**

This release fixes an important issue related to the handling of Mule runtime exceptions by the APIkit router.

The following behavior was fixed: the execution of the flow in the router might result in a MuleException, a MuleRuntimeException, or an Exception. APIkit was only handling the first one by rethrowing it. The others were wrapped in a DefaultMuleException, which is mapped to an UNKNOWN error.

## [](#compatibility)Compatibility

- Mule Runtime 4.0.0+
- Anypoint Studio 7.0.2

## [](#fixed-in-this-release)Fixed in this Release

- APIkit Router incorrectly wraps MuleRuntimeException. (APIKIT-1129)

## [](#see-also)See Also

- [Known Issues](https://help.salesforce.com/s/issues)