"Does anyone know how to make it more useful in these situations?"
First use CMD-SHIFT-R in Xcode to display the console window. You should have seen an error accessing an array with an out of bounds index.
Also, use CMD-Y to create and debug (vice CMD-R to create and run) your application. If it crashes, you will end up in the debugger (CMD-SHIFT-Y for the debug window) with the exact line of code that crashes, as well as the stack trace, all your variables, etc.
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