/home/wiking/shogun/src/shogun/io/serialization/JsonSerializer.cpp: In constructor 'rapidjson::PrettyWriter<OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags>::PrettyWriter(OutputStream&, StackAllocator*, std::size_t) [with OutputStream = COutputStreamAdapter; SourceEncoding = rapidjson::UTF8<>; TargetEncoding = rapidjson::UTF8<>; StackAllocator = rapidjson::CrtAllocator; unsigned int writeFlags = 2; std::size_t = long unsigned int]':
/home/wiking/shogun/src/shogun/io/serialization/JsonSerializer.cpp:327:34: error: 'const size_t rapidjson::Writer<COutputStreamAdapter, rapidjson::UTF8<>, rapidjson::UTF8<>, rapidjson::CrtAllocator, 0>::kDefaultLevelDepth' is protected within this context
   PrettyJsonWriter writer(adapter);
                                  ^
In file included from /home/wiking/shogun/build/RapidJSON/src/RapidJSON/include/rapidjson/prettywriter.h:18:0,
                 from /home/wiking/shogun/src/shogun/io/serialization/JsonSerializer.cpp:14:
/home/wiking/shogun/build/RapidJSON/src/RapidJSON/include/rapidjson/writer.h:262:25: note: declared protected here
     static const size_t kDefaultLevelDepth = 32;
                         ^~~~~~~~~~~~~~~~~~
/home/wiking/shogun/src/shogun/io/serialization/JsonSerializer.cpp:327:34: note:   when instantiating default argument for call to rapidjson::PrettyWriter<OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags>::PrettyWriter(OutputStream&, StackAllocator*, std::size_t) [with OutputStream = COutputStreamAdapter; SourceEncoding = rapidjson::UTF8<>; TargetEncoding = rapidjson::UTF8<>; StackAllocator = rapidjson::CrtAllocator; unsigned int writeFlags = 2; std::size_t = long unsigned int]
   PrettyJsonWriter writer(adapter);