I can see some methods and interfaces starting with RCT*** meaning that you have a react native app.
The exception is thrown at RCTFatal + 668 (RCTAssert.m:146) so I guess it asserts ie checks some of the codes in react native and then throws exception.
You might have an undefined string passed to text component or string in a checkbox etc.
This is most probably an exception from your react native code so i'd double check that.
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Xcode
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