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The DITA to CHM transformation fails with the following error: [exec] HHC5010: Error: Cannot open "fileName.chm". Compilation stopped.


This error occurs when the CHM output file is opened and the transformation scenario cannot rewrite its content.


To solve this issue, close the CHM help file and run the transformation scenario again.

Tip: 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, it will report detected errors, such as topics referenced in other topics (but not in the DITA map), broken links, and missing external resources.