Here are a few questions that I've had to answer from
students and other users. Although I try to make the
add-ins robust, users often do things that I would never
have suspected. If you have trouble look over the list
below. Read the section Add-in
Basics on this site where there are other frequently
asked questions. Also, read the instructions for the
add-in you are attempting to use.
When I click on a button on a worksheet a error message,
saying "A document with the name 'add-in name'
is already open. You cannot open two documents with
the same name, even of the documents are in different
The worksheets in the ORMM CD chapter files and also
the demo worksheets have buttons. These buttons are
linked to the add-in on the author's computer. To make
the buttons connect to the add-in that you have installed
on your computer follow these instructions.
For worksheets with buttons, we have included a Relink
Buttons command. This command creates new buttons
linked to the your Add-in. This usually must be done
for each worksheet in the workbook.
The same problem results when there are user-defined
functions on the worksheet. In almost all cases the
Relink buttons command creates the proper links. If
this doesn't work use the Links Command on the Edit
menu of Excel. This command allows you to change the
links from the author's computer to your computer.
I get an runtime error message. What do I do?
We have tried to find all errors, but some may still
exist. Contact the author
with as much information as possible. One way to find
the exact source of the error is to go to the Visual
Basic Editor by selecting Macros from the Excel Tools
menu. In the Project Explorer, click on the name of
the add-in. Enter the password 'ppp'. Try to generate
the error again. If it occurs again, click the Debug
button. The focus will move to the program where the
error occurs. If the line simply formats a cell, you
can make the line a comment by putting an apostrophe
(') before the line. Otherwise copy the line and put
it into an e-mail to the author.
VBA sometimes makes errors on international versions
of Excel in cases where it won't make the error on the
English language version. Tell the author as much about
the problem as you can.
I am using a version of Excel 97 or earlier and get
The add-in were initially created with Excel 97 or later,
but changes have added features which are not compatible
with Excel 97. Try a more modern version of Excel.
Excel takes a long time to open or terminates unexpectedly.
One reason may be that you have too many add-ins installed.
Only install the add-ins you are immediately using.
Also, it is good idea to use only a few worksheets in
a workbook and to close any workbooks you are not using.
Excel may fail and say that it can't make a button when
the add-in is creating a new form.
Delete the partial page created and save your work.
Shut down Excel and the restart. The problem may go
away. A general rule for problems is to shut down and
When I open an add-in (.xla) I get a message warning
You are installing the add-in incorrectly. It must be
installed through the Add-ins Command on the Tools Menu.
You can also use the OR_MM add-in or OM_IE add-in to
install and uninstall add-ins.
When trying to create a math programming model, I get
an error message regarding the Excel Solver.
Be sure the Excel Solver is installed. If it is the
word Solver appears on the Tools menu. If the Solver
does not appear the Solver add-in is probably not installed.
It comes on the Excel or Microsoft Office CD, but it
may not be installed with a Typical installation
If the Excel Solver is installed and you get the message,
open the Solver dialog before trying to build the math
programming model. This will establish a link to the
Solver and the problem should be resolved.
I create a math programming model or other type of model
that creates a named worksheet. I changed the name of
the worksheet and now it won't work.
You should not change the name of a worksheet that was
created by the add-in. Often the add-in names ranges
on the worksheet with a prefix that is the same as the
worksheet name. If you change the worksheet name the
add-in cannot discover the prefix.