# tex4ebook: Fatal error - Command tex4ht returned exit code 1

I try to use tex4ebook with MikTex and TeXnicCenter, but it always leads to a fatal error.

My simple MWE:

\documentclass{article}
\begin{document}
Text
\end{document}


I tried a lot of different commands to be passed to the Compiler, e.g.

-c config.cfg -f epub3 "%wm"


but it does not work. The output/error is like that:

tex4ebook> [WARNING] tocid: char-def module not found
tex4ebook> [WARNING] tocid: cannot fix section id's
tex4ebook> This is pdfTeX, Version 3.141592653-2.6-1.40.23 (MiKTeX 21.10)
tex4ebook> entering extended mode
tex4ebook> [FATAL] make4ht-lib: Fatal error. Command tex4ht returned exit code 1


Which commands have to be passed to the Compiler in TeXnicCenter to make tex4ebook running?

• try to add the -a debug option to see full error log, and post it here. TeX4ebook hides log by default and it can contain some information why it fails on your machine. Jan 21 at 23:13
• @michal.h21: Thanks for the hint - I had to copy the bibtex.exe and makeindex.exe from miktex/bin/x64 one folder up to miktex/bin - now it works :-)
– Jack
Jan 22 at 10:26
• Ah, I wasn't suspecting bibtex or makeindex to be culprits, but I am glad that you found the fix :) Jan 22 at 11:11
• Thanks a lot - I would not have found it without the full error log :)
– Jack
Jan 22 at 11:16