ios 文字识别Demo 装入手机后，点击任何按钮都闪退
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报错提示如下：
2017-09-08 11:51:40.276280+0800 AipOcrDemo[6639:2283387] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present a nil modal view controller on target .'
*** First throw call stack:
(0x183682fe0 0x1820e4538 0x189b25ebc 0x189b287e4 0x1898a5794 0x100036960 0x100038338 0x1898dfa9c 0x18998f820 0x189a41594 0x189a33630 0x1897a728c 0x1836309a8 0x18362e630 0x18362ea7c 0x18355eda4 0x184fc9074 0x189819c9c 0x10003ae14 0x18256d59c)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
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打令2016：
报错提示如下：
2017-09-08 11:51:40.276280+0800 AipOcrDemo[6639:2283387] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present a nil modal view controller on target .'
*** First throw call stack:
(0x183682fe0 0x1820e4538 0x189b25ebc 0x189b287e4 0x1898a5794 0x100036960 0x100038338 0x1898dfa9c 0x18998f820 0x189a41594 0x189a33630 0x1897a728c 0x1836309a8 0x18362e630 0x18362ea7c 0x18355eda4 0x184fc9074 0x189819c9c 0x10003ae14 0x18256d59c)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
回复打令2016：你好，请详细说明使用的版本，复现过程，修改的代码。
直接下载的SDK经过测试，demo可直接使用