ios - App gives exception on launch when added Exception Breakpoint in debugger -

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i developing tabbar based application , on launching app in debug mode exception @ app launch.

this happened when add exception breakpoint. although can move ahead when switching breakpoint off , app can still run. wanted figure out why happening.

i have attached stack track snapshot seen on thread 1 when debugger stops.

stack trace image stopped debugger when adding exception breakpoint in xcode


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