[tex4ht] tex4ebook error with latest texlive

[Chet Murthy]

Michal,

I have a new MWE (based on your last instructions) that exhibits a number
of new errors.  I'm attaching the contents of a directory with a Makefile;
that directory contains the three scripts you've sent me, and the Makefile
runs the build.  And of course, a new "sample.tex" that elicits the errors
below.

(1) When I run epubcheck ( v5.2.1, the latest ) on sample.epub, I get the
first attached set of errors.

(2) the htlatex run itself emits errors that seem to imply that it doesn't
understand the latex code, even though that same code passes lualatex
without errors.

(3) Also, since this is supposed to be an MWE, I didn't try to preserve a
-bunch- of errors of the form of #2, from all over the source code of my
book.  So it's possible there are a bunch more.

This sample has a number of elements in it, and if I remove any one of
them, it appears that at least one of the errors below disappears.  But it
was small enough that I figured I'd leave them in.

Your advice as always greatly appreciated.
--chet--

====
ERROR(RSC-005): sample.epub/OEBPS/samplech1.html(12,37): Error while
parsing file: Duplicate "one"
ERROR(RSC-005): sample.epub/OEBPS/samplech1.html(12,100): Error while
parsing file: Duplicate "x2-10001"
ERROR(RSC-005): sample.epub/OEBPS/samplech1.html(13,44): Error while
parsing file: Duplicate "one"
ERROR(RSC-005): sample.epub/OEBPS/samplech1.html(13,61): Error while
parsing file: Duplicate "x2-10001"
ERROR(RSC-012): sample.epub/OEBPS/sample.html(11,262): Fragment identifier
is not defined.

====
[ERROR]   htlatex: Compilation errors in the htlatex run
[ERROR]   htlatex: Filename Line Message
[ERROR]   htlatex: ./sample.tex ? Undefined control sequence.
[STATUS]  htlatex:  <- \else \HCode {</span>}\fi l.23 \end{ocaml}
[ERROR]   htlatex: Compilation errors in the htlatex run
[ERROR]   htlatex: Filename Line Message
[ERROR]   htlatex: ./sample.tex ? Undefined control sequence.
[STATUS]  htlatex:  <- \else \HCode {</span>}\fi l.23 \end{ocaml}
[ERROR]   htlatex: Compilation errors in the htlatex run
[ERROR]   htlatex: Filename Line Message
[ERROR]   htlatex: ./sample.tex ? Undefined control sequence.
[STATUS]  htlatex:  <- \else \HCode {</span>}\fi l.23 \end{ocaml}
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