The DITA to CHM Transformation Fails

Oxygen XML Editor uses the DITA Open Toolkit and the HTML Help compiler (part of the Microsoft HTML Help Workshop) to transform DITA content into Compiled HTML Help (or CHM in short).

It is a good practice to validate the DITA map before executing the transformation scenario. To do so, run the Validate and Check for Completeness action. Depending on the selected options, this action reports errors, such as topics referenced in other topics (but not in the DITA Map), broken links, and missing external resources.

However, the execution of the transformation scenario may still fail. Reported errors include:
Related information
Compiled HTML Help (CHM) Output Format