问集成超级播放器时怎么解决这个报错？

2018-08-12 16:47:21.833995+0800 TestTXPlayer[70367:451146] IJKMEDIA:===== custom modules begin =====

2018-08-12 16:47:21.926033+0800 TestTXPlayer[70367:451146] IJKMEDIA:register demuxer : ijklivehook

2018-08-12 16:47:21.926455+0800 TestTXPlayer[70367:451146] IJKMEDIA:===== custom modules end =====

2018-08-12 16:47:22.217260+0800 TestTXPlayer[70367:451146] IJKMEDIA:av_version_info: ff3.3--fx0.8.0--20180529--001

2018-08-12 16:47:22.217661+0800 TestTXPlayer[70367:451146] IJKMEDIA:ijk_version_info: release-4.9-12-g55a42aebb

2018-08-12 16:47:22.508698+0800 TestTXPlayer[70367:451146] level:1|module:TXLiteAVSDK| IJK: setPlaybackRate 1.000000

2018-08-12 16:47:22.509065+0800 TestTXPlayer[70367:451146] level:1|module:TXLiteAVSDK| IJK: setMute 0

2018-08-12 16:47:22.512286+0800 TestTXPlayer[70367:451855] +[NSString ijk_stringBeEmptyIfNil:]: unrecognized selector sent to class 0x1104592a8

不知道怎么找到这个类啊。。。