I have built several .qch Help systems. One of them gives this error on several links in the table of contents (TOC) that is displayed in QtCreator:

Error loading: qthelp://com.nov.novos.appssdk.2.0/doc/Content/Getting_Started.htm

The domain is of my own devising (my company's domain name plus product and version).

I know that the content is in the .qch file. I can get to it from the index or links from other pages.

The .qhp file looks like this. One of the links that produces the error is ./Content/Getting_Started.htm.

Qt Code: 
  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <QtHelpProject version="1.0">
  3.     <namespace>com.nov.novos.appssdk.2.0</namespace>
  4.     <virtualFolder>doc</virtualFolder>
  5.     <customFilter name="NOVOS Apps SDK 2.0"> 
  6.            <filterAttribute>NOVOS</filterAttribute> 
  7. 	   <filterAttribute>App</filterAttribute>
  8.            <filterAttribute>SDK</filterAttribute>
  9.            <filterAttribute>Framework</filterAttribute>
  10.     </customFilter>
  11.     <filterSection>
  12. 	<filterAttribute>NOVOS</filterAttribute>
  13.         <filterAttribute>App</filterAttribute>
  14.         <filterAttribute>SDK</filterAttribute>
  15.         <filterAttribute>Framework</filterAttribute>
  16.         <toc>
  17. 		<section title="NOVOS Apps SDK 2.0" ref="./Content/TOC.htm">
  18. 		...
  19. 		<section title="Getting Started" ref="./Content/Getting_Started.htm">
  20. 		<section title="Obtaining Software and Documentation" ref="./Content/Getting_Started.htm#Download"></section>
  21.                 ...
  22.                 </section>
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I am using Qt 5.5.0, Community version, with QtCreator 3.4.2, on Windows 7 and Debian Linux 6.0, x86 64-bit.

This problem appears consistently on every computer where it is tried.

It appears to be related to a known bug in QtCreator, which was reported in 2014:
https://bugs.launchpad.net/ubuntu/+bug/1356515


- Jim Casey, Sr. Technical Writer at National Oilwell Varco, Houston, Texas, U.S.A.