The error could be one of the following:
<UL>
<LI>You have already checked the example out using <TT><B>getex</B></TT>. In
this case you will get an error message like the following:
<BLOCKQUOTE>
<PRE>
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.
</PRE>
</BLOCKQUOTE>
<LI>The example doesn't exist. In this case the message looks like:
<BLOCKQUOTE><PRE>
Oops, there's no example directory XX12.
Quitting with no harm done.
</PRE></BLOCKQUOTE>
<LI>You are not authorised to use the examples system. In this case the
message is
<BLOCKQUOTE><PRE>
You aren't a member of the examples group.
</PRE></BLOCKQUOTE>
If this seems unjust or plain wrong then send e-mail to 
<TT>help&#64;damtp.cam&#46;&#97;&#99;&#46;uk</TT> and complain -- any
of the computer officers in the department should be able to help.
<LI>Someone else has already checked out the example. The message is something
like:
<BLOCKQUOTE><PRE>
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.
</PRE></BLOCKQUOTE>

</UL>