Failed to launch simulated application: Unknown error

Question

• OS X 10.5.7 (genuine Mac)
• Xcode 3.1.3
• iPhone SDK 3.0

When I try to execute my iPhone application in simulator, I get the dreaded error

Answer 1

I was getting this problem when I had my Info.plist file set to export to the target. You might want to check that, de-selecting that option fixed the problem for me.