Error appim to start appium

I have the following error:
error: Failed to start an Appium session, err was: Instruments did not launch successfully–please check your app paths or bundle IDs and try again
Could not start a new session Be sure the Appium server is running with an application opened by using the “App Path” parameter in Appium.app (along with package and activity for Android) or by connecting with selenium client and supplying this in the desired capabilities object.

Help please

Version apium server 1.3.0.
Version appium client 0.5.1
Mac osx 10.7.1
I have file .ipa