Compilation error: ‘ns3_ai_gym’ namespace not found in ns3-ai-gym-interface.cc

[jixiaofeng1999]

Hello,

I'm encountering a compilation issue when trying to build a project that includes the NS3 AI . The compiler is unable to find the ns3_ai_gym namespace, which should be generated from a protobuf file. Below is the error output when trying to compile with CMake and Ninja:

FAILED: contrib/ai/CMakeFiles/libai-obj.dir/model/gym-interface/cpp/ns3-ai-gym-interface.cc.o
/usr/bin/ccache /usr/bin/c++ -DEIGEN_MPL2_ONLY -DHAVE_EIGEN3 -DHAVE_GSL -DHAVE_LIBXML2 -DHAVE_SQLITE3 -DHAVE_STDINT_H -DNS3_ASSERT_ENABLE -DNS3_BUILD_PROFILE_DEBUG -DNS3_LOG_ENABLE -DPROJECT_SOURCE_PATH="/home/ji/ns-allinone-3.38/ns-3.38" -D__LINUX__ -I/usr -I/home/ji/ns-allinone-3.38/ns-3.38/build/include -I/usr/include/eigen3 -I/usr/include/freetype2 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gtk-3.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/atk-1.0 -I/usr/include/libxml2 -I/usr/include/python3.10 -g -fPIC -fno-semantic-interposition -fdiagnostics-color=always -Wall -Werror -Wno-error=deprecated-declarations -std=gnu++17 -Winvalid-pch -include /home/ji/ns-allinone-3.38/ns-3.38/cmake-build-debug/CMakeFiles/stdlib_pch-debug.dir/cmake_pch.hxx -MD -MT contrib/ai/CMakeFiles/libai-obj.dir/model/gym-interface/cpp/ns3-ai-gym-interface.cc.o -MF contrib/ai/CMakeFiles/libai-obj.dir/model/gym-interface/cpp/ns3-ai-gym-interface.cc.o.d -o contrib/ai/CMakeFiles/libai-obj.dir/model/gym-interface/cpp/ns3-ai-gym-interface.cc.o -c /home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc: In member function ‘void ns3::OpenGymInterface::Init()’:
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:89:5: error: ‘ns3_ai_gym’ has not been declared
89 | ns3_ai_gym::SimInitMsg simInitMsg;
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:92:9: error: ‘ns3_ai_gym’ has not been declared
92 | ns3_ai_gym::SpaceDescription spaceDesc;
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:93:9: error: ‘spaceDesc’ was not declared in this scope
93 | spaceDesc = obsSpace->GetSpaceDescription();
| ^~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:94:9: error: ‘simInitMsg’ was not declared in this scope
94 | simInitMsg.mutable_obsspace()->CopyFrom(spaceDesc);
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:98:9: error: ‘ns3_ai_gym’ has not been declared
98 | ns3_ai_gym::SpaceDescription spaceDesc;
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:99:9: error: ‘spaceDesc’ was not declared in this scope
99 | spaceDesc = actionSpace->GetSpaceDescription();
| ^~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:100:9: error: ‘simInitMsg’ was not declared in this scope
100 | simInitMsg.mutable_actspace()->CopyFrom(spaceDesc);
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:109:45: error: ‘simInitMsg’ was not declared in this scope
109 | msgInterface->GetCpp2PyStruct()->size = simInitMsg.ByteSizeLong();
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:116:5: error: ‘ns3_ai_gym’ has not been declared
116 | ns3_ai_gym::SimInitAck simInitAck;
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:118:5: error: ‘simInitAck’ was not declared in this scope
118 | simInitAck.ParseFromArray(msgInterface->GetPy2CppStruct()->buffer,
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc: In member function ‘void ns3::OpenGymInterface::NotifyCurrentState()’:
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:151:5: error: ‘ns3_ai_gym’ has not been declared
151 | ns3_ai_gym::EnvStateMsg envStateMsg;
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:153:5: error: ‘ns3_ai_gym’ has not been declared
153 | ns3_ai_gym::DataContainer obsDataContainerPbMsg;
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:156:9: error: ‘obsDataContainerPbMsg’ was not declared in this scope; did you mean ‘obsDataContainer’?
156 | obsDataContainerPbMsg = obsDataContainer->GetDataContainerPbMsg();
| ^~~~~~~~~~~~~~~~~~~~~
| obsDataContainer
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:157:9: error: ‘envStateMsg’ was not declared in this scope
157 | envStateMsg.mutable_obsdata()->CopyFrom(obsDataContainerPbMsg);
| ^~~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:160:5: error: ‘envStateMsg’ was not declared in this scope
160 | envStateMsg.set_reward(reward);
| ^~~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:168:36: error: ‘ns3_ai_gym’ has not been declared
168 | envStateMsg.set_reason(ns3_ai_gym::EnvStateMsg::SimulationEnd);
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:172:36: error: ‘ns3_ai_gym’ has not been declared
172 | envStateMsg.set_reason(ns3_ai_gym::EnvStateMsg::GameOver);
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:192:5: error: ‘ns3_ai_gym’ has not been declared
192 | ns3_ai_gym::EnvActMsg envActMsg;
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:195:5: error: ‘envActMsg’ was not declared in this scope
195 | envActMsg.ParseFromArray(msgInterface->GetPy2CppStruct()->buffer,
| ^~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:216:5: error: ‘ns3_ai_gym’ has not been declared
216 | ns3_ai_gym::DataContainer actDataContainerPbMsg = envActMsg.actdata();
| ^~~~~~~~~~
/home/ji/ns-allinone-3.38/ns-3.38/contrib/ai/model/gym-interface/cpp/ns3-ai-gym-interface.cc:218:60: error: ‘actDataContainerPbMsg’ was not declared in this scope; did you mean ‘actDataContainer’?
218 | OpenGymDataContainer::CreateFromDataContainerPbMsg(actDataContainerPbMsg);
| ^~~~~~~~~~~~~~~~~~~~~
| actDataContainer
ninja: build stopped: subcommand failed.

I am using the following tools and versions:

Protobuf version: libprotoc 3.12.4
NS3 version: ns3.38
Operating System: ubuntu 22.04
Could you please help me identify what might be causing this issue and how to resolve it?

Thank you for your assistance.

[kaoutharouali]

Hi,
did you solve the problem ?

[kaoutharouali]

Hi,
for me I solved the problem.
I have installed ns3gym and na3-ai, that's why I have this error.
Uninstalling ns3gym solved the issue.
Regards,

[jixiaofeng1999]

Hi, for me I solved the problem. I have installed ns3gym and na3-ai, that's why I have this error. Uninstalling ns3gym solved the issue. Regards,

Hello,

Thank you for your helpful response. Uninstalling ns3gym indeed resolved the problem.

Best regards,