Sharepoint Attribute Query - Error Message

[GarrettMoeller]

Greetings,
I am able to get the default Sharepoint Attribute Query to work
(drop-down list connected to a Sharepoint list named Cities)

When I try to connect it to another list - on the same page - being very careful to get the list name and internal field names correct,
I get the following error message:
[ATTACH=CONFIG]18309[/ATTACH]

I have tried multiple times...
What could this be?

[GarrettMoeller]

Interesting -
So, I built the same tool with another computer and it worked!
Must be something to do with one of the references - possibly ESRI.ArcGIS.Client.Extensibility
I was getting a message saying that I need to use the 2.4 version from the computer that was producing the error.
I would choose the 2.4 version and the error would go away - so I thought...

[GarrettMoeller]

I was able to reproduce the error!
It is occuring when you take one map, upload the attribute query extension, get that one working....
Then, upload another attribute query extension for a different map, by replacing the current extension, but leaving the icon for the original on the first map - it breaks both of them.

So the question is, how to have more than one of the same extension in there - it is not as easy as just renaming the extension - can't do that... trying to change the namespace breaks things... how are users going about this?  So that you can have more than one attribute query and not have to replace because it has the same name in the extensions folder. I tried to completely rebuild it also and there are references in there that are hard to find... Just simply taking working extension and somehow renaming.