"nil" passed to a callee that requires a non-nil argument

[alexandrahably]

In file: https://github.com/tombenner/nui/blob/master/NUI/Core/Parser/NUIParserDelegate.m

[NSException raise:@"Unexpected value token" format:nil];

The "format" arg can't be nil, it must be a string.

https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSException_Class/#//apple_ref/occ/clm/NSException/raise:format: