致命异常：NSInvalidArgumentException
*** [NS JSONSerialization dataWithJSONObject：options：error：]：value参数为nil
*** [NS JSONSerialization dataWithJSONObject：options：error：]：value参数为nil
基金会[NSJSONSerialization dataWithJSONObject：options：error：] 84
ProjectName – [ANSWriteEventOperation logLineWithTimestamp：eventName：payloadDictionary：] 72
ProjectName – [ANSWriteEventOperation generateFormattedLogLineWithMetdata：timestamp：] 142
ProjectName – [ANSWriteEventOperation initWithEvent：Metadata：logFileUrl：] 200
项目名
__38- [ANSAnswersController logCrashEvent：] _ block_invoke 600
基金会NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK 8
