idAliyunIExporter到底怎么用？

我创建了editor实例，并由editor导出了exporter，然后我就开始用exporter开始导出视频。
但是回调只是走了- (void)exporterDidStart，其他的回调都没有走，并且还报出了
2017-09-20 10:51:07.164291+0800 recorder[6526:2262885] 导出开始
QuCore-RCE-Open [shader_program.cpp 75] please use this shader before set attrib
QuCore-RCE-Open [GLPort.h 69] after after draw call() glError (0x501)

QuCore-RCE-Open [shader_program.cpp 75] please use this shader before set attrib
QuCore-RCE-Open [shader_program.cpp 92] please use this shader before set uniform
QuCore-RCE-Open [shader_program.cpp 75] please use this shader before set attrib
QuCore-RCE-Open [GLPort.h 69] after after draw call() glError (0x501)

QuCore-RCE-Open [shader_program.cpp 75] please use this shader before set attrib
QuCore-RCE-Open [shader_program.cpp 92] please use this shader before set uniform
QuCore-RCE-Open [shader_program.cpp 75] please use this shader before set attrib
QuCore-RCE-Open [GLPort.h 69] after after draw call() glError (0x501)
的错误。
我不知道这是啥原因，请明白的人帮我解答一下，谢谢。