DSXchange

I seem to have encountered an error while exporting executables in the DataStage Manager (Export > Executable Job )

Run-time error '457'
This key is already associated with an element of this collection

Can someone advise me on what to do?

Contact Ascential Support with the precise version of DataStage on the precise platform you are using (not just 7.x -- 7.0.1? 7.1? 7.5? 7.5a?) There may be a patch for you.

We recently encountered the same message.
We resolved the problem, thanks to Ascential Support, when we found and removed some duplicate entries from the DSParams file, located in the project directory (which contains the user-defined environment variables, amongst other things).