问iOS 上传SDK集成报错？

按照文档的说明，将TXYBase.h TXYUploadManager.h 和 libTXYUploader.a添加到工程后,添加了依赖库,并设置Other LinkerFlags，出现大量报错Undefined symbols for architecture x86_64: "std:string:find_first_of(char const, unsigned long, unsigned long) const", referenced from: void wup::UniAttribute<taf::BufferWriter, taf::BufferReader, std::allocator>::get<FileCloud: irCreateRsp>(std::string const&, FileCloud: irCreateRsp&) in libTXYUploader.a(TXYRespPacketEx.o) void wup::UniAttribute<taf::BufferWriter, taf::BufferReader, std::allocator>::get<FileCloud::ObjectDeleteRsp>(std::string const&, FileCloud::ObjectDeleteRsp&) in libTXYUploader.a(TXYRespPacketEx.o) void wup::UniAttribute<taf::BufferWriter, taf::BufferReader, std::allocator>::get<FileCloud::FileDirStatRsp>(std::string const&, FileCloud::FileDirStatRsp&) in libTXYUploader.a(TXYRespPacketEx.o) void wup::UniAttribute<taf::BufferWriter, taf::BufferReader, std::allocator>::get<FileCloud::FileDirUpdateRsp>(std::string const&, FileCloud::FileDirUpdateRsp&) in libTXYUploader.a(TXYRespPacketEx.o) void wup::UniAttribute<taf::BufferWriter, taf::BufferReader, std::allocator>::get<FileCloud: irListRsp>(std::string const&, FileCloud: irListRsp&) in libTXYUploader.a(TXYRespPacketEx.o) void wup::UniAttribute<taf::BufferWriter, taf::BufferReader, std::allocator>::get<FileCloud::FileControlRsp>(std::string const&, FileCloud::FileControlRsp&) in libTXYUploader.a(TXYRespPacket.o) void wup::UniAttribute<taf::BufferWriter, taf::BufferReader, std::allocator>::get<FileCloud::stPhotoUploadRsp>(std::string const&, FileCloud::stPhotoUploadRsp&) in libTXYUploader.a(TXYRespPacket.o) ... "std:string:find(char const, unsigned long, unsigned long) const", referenced from: l004 in libTXYUploader.a(TXYUploadHttpStream.o) l005 in libTXYUploader.a(TXYUploadHttpStream.o)Xcode版本7.3.请问如何解决？急求。。谢谢~！！！