debug-_SwiftValue-unsignedIntegerValue

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crash:

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let attr = try? NSMutableAttributedString(data: data,
                                          options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                                                    NSCharacterEncodingDocumentAttribute: String.Encoding.utf8],
                                          documentAttributes:nil)
// log:
2017-04-17 14:04:38.140 [41275:463875] -[_SwiftValue unsignedIntegerValue]: unrecognized selector sent to instance 0x608000256620

WTF! 这个方法启动时不能直接调用，要异步？