Springer Nature Template + Package problem [duplicate]

Question

I just started working on a journal article which is supposed to be submitted according to the sn-jnl template. I therefore downloaded the zip and started adding my content.

Unfortunately I soon discovered that the glossaries package and the todonotes package break the compilation. The error is reproducible even with their Overleaf template.

• download zip/open overleaf template -> compiles well
• add \usepackage{glossaries} in the head -> error

The same problem occurs with \usepackage{todonotes}. Does anybody have a solution to this issue?

I consider these packages to be rather common and never had any issues with any other conference/journal template, so I am confused as to why this happens.

I'm aware that there are alternatives to these two, but I'm worried that other (more important) packages are going to raise similar issues.

Error:

Incomplete \iffalse; all text was ignored after line 79.

 
‪/usr/local/texlive/2020/texmf-dist/tex/latex/fp/fp.sty, 25‬
<inserted text> 
                \fi 
l.25 
     
The file ended while I was skipping conditional text.
This kind of error happens when you say `\if...' and forget
the matching `\fi'. I've inserted a `\fi'; this might work.

EDIT: Here's a screenshot of what I see, including the first page which is the actual problem (it's garbage)

---

UPDATE: (Quick) Fix

Thanks to @simon-dispa 's comment, I learned where to look in the sn-jnl.cls. It seems that actually the problem is on line 311: \usepackage{program} causes issues.

The good part: When uncommenting this line, the compilation (and everything else) works smoothly.

Now to the bad part: I have to modify the official Springer template to get things running. I personally do not need it here, but clearly I'm modifying things that I shouldn't, which is not ideal.

Answer 1

I also had this problem, and found an answer in another post on Tex.Stockexchange.

For self-containedness, I include here the answer (courtesy of the user David Carlisle)

The class includes the program package which makes some unfortunate choices including globally making | active, it provides a command

\normalbaroutside which you can issue in the preamble then | only gets the special meaning inside program environments.

So the solution is to call \normalbaroutside in the preamble before loading glossaries/tikz/todonotes. The advantage is that this way sn-jnl.cls can remain unchanged.