Make sure the line numbers haven't changed!

When cross referencing line numbers from the logs ensure you look at the final files for the version in question, not the new version files you have been working on and changing!

Look For Specific Actions

The top / last few logs of the thread may be very cryptic things operating in frameworks, like UIKit.  Look down for the first event that was part of your application code, such as a user pushes a button (dismissWithClickedButtonIndex) which then went on to cause the log stepes above it.