Premiere Pro Audio Channels Screwup?

[Slim_Jim]

In my project I got three audio tracks. 1 Mono, 2 Stereo.

When I try to export my movie (File\Export\Movie) I get the error message:

"
The number of audio channels to create in the exported file
must be equal to or less than the number of channels in the source.

Please reduce the number of audio channels in Export Settings.
"

Thing is: I can't reduce the number of audio channels in the export settings.
The box where it says "Channels" under Audio-settings in the export window is empty, and the drop-down list also shows nothing...

Solution?

[Guiboche]

In the project window, select your mono track. Choose "Clip > Audio Options > Treat As Stereo"

Once that is done, I'd redrag the mono file into the timeline (it can now be dragged into stereo tracks) and delete the original mono track.