The error could be one of the following:

You have already checked the example out using getex. In this case you will get an error message like the following:

There is a problem: you have had A1N1.tex since Mon Jan  5 15:19:51 1998.
You must put this file back using putex before you or anyone else can get
example A1N1 out again.

Quitting with no harm done.

The example doesn't exist. In this case the message looks like:

Oops, there's no example directory XX12.
Quitting with no harm done.

You are not authorised to use the examples system. In this case the message is
```
You aren't a member of the examples group.
```
If this seems unjust or plain wrong then send e-mail to help@maths.cam.ac.uk and complain -- any of the computer officers in the department should be able to help.

Someone else has already checked out the example. The message is something like:

There is a problem: the following people have control of files:

  Jon Peatfield (jp107) has A1N1.tex

You'll have to negotiate with these people to get them to return the files
using putex before you can get them yourself.

Quitting with no harm done.

You are trying to add a new examples sheet but there is already an old hidden examples sheet with the same code. The message looks like:
```
The example A1N1 already exists.
Quitting with no harm done.
```
Email help@maths.cam.ac.uk and they will archive the old sheet and upload the new one.
The generation of the DVI file failed because latex was run as pdflatex. The message looks like:
```
dvips error 1:./A1N1.dvi
Quitting with no harm done.
```
Email help@maths.cam.ac.uk and remember to include any style files which are part of the examples sheet. The IT team should be able to tweak the files so that the dvi file is generated correctly and get rid of any rubbish left by the failed putex command.