Why a processing error under Windows but not Linux?

Kenward Vaughan kay_jay at kvaughan.family
Fri Mar 6 01:25:09 UTC 2020

Hi all,

I have my students using LyX for their organic chemistry lab reports.  I 
use a pretty standard installation at home under Debian, while most of 
them use Windows or Mac.  One student in particular tried using an 
example file I posted for them, added material to it, then ran into 
problems when trying to view a pdf (or export, etc).

I had him send me both the original file and his file.  Both properly 
process for me.  No one else has reported issues (yet) like this.  If he 
generates a trivial file with a few words in it, no problem is encountered.

The wording of the error message is the following:


The control sequence at the end of the top line

of your error message was never \def'ed. If you have

misspelled it (e.g., `\hobx'), type `I' and the correct

spelling (e.g., `I\hbox'). Otherwise just continue,

and I'll forget about whatever was undefined.

Is it possible that his installation of TexLive is not complete? Or is 
there something else I'm oblivious to which would explain this?

What else is important for people to be able to problem-solve this?  I'm 
certainly not a guru at this sort of thing.


In a completely rational society, the best of us would aspire to be
_teachers_ and the rest of us would have to settle for something less,
because passing civilization along from one generation to the next
ought to be the highest honor and the highest responsibility anyone
could have.     - Lee Iacocca

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