Error, "Internal error encountered, Failed to generate WebHelp." when you generate a merged project (Robohelp 6)

When you try to generate a merged project from Adobe RoboHelp 6, you receive these error messages:

"Internal error encountered, Failed to generate WebHelp."

and

"Warning: [path to file] cannot be copied to [path to output]. reason: source does not exist."

Reason

This can occur if you have a relative link in your project that points to a location that is not contained within your project.

Solution

Update RoboHelp HTML to resolve this issue.

Backup the MpjSingleSource.dll file:

Install the update:

You should now be able to generate your project without the above errors.