I am trying to use the ESP32-A2DP library with this library (by following the documentation here). When I try and build I get an error that says the reference to "VolumeControl is ambiguous". If I implement the Bluetooth library in its own folder I have no issues, it's only when I include it in the Audio tools project. Can anyone help, please?

In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:42:0, from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:73:37: error: reference to 'VolumeControl' is ambiguous class DefaultVolumeControl : public VolumeControl ^ .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:27:7: note: candidates are: class VolumeControl class VolumeControl ^ In file included from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioStreams.h:8:0, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioOutput.h:7, from .pio\libdeps\esp32dev\audio-tools\src/AudioFilter/Equilizer.h:3, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools.h:16, from src\main.cpp:2: .pio\libdeps\esp32dev\audio-tools\src/AudioTools/VolumeControl.h:11:7: note: class audio_tools::VolumeControl class VolumeControl { ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:42:0, from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:96:47: error: reference to 'VolumeControl' is ambiguous class SimpleExponentialVolumeControl : public VolumeControl ^ .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:27:7: note: candidates are: class VolumeControl class VolumeControl ^ In file included from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioStreams.h:8:0, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioOutput.h:7, from .pio\libdeps\esp32dev\audio-tools\src/AudioFilter/Equilizer.h:3, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools.h:16, from src\main.cpp:2: .pio\libdeps\esp32dev\audio-tools\src/AudioTools/VolumeControl.h:11:7: note: class audio_tools::VolumeControl class VolumeControl { ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:42:0, from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:117:36: error: reference to 'VolumeControl' is ambiguous class LinearVolumeControl : public VolumeControl ^ .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:27:7: note: candidates are: class VolumeControl class VolumeControl ^ In file included from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioStreams.h:8:0, Compiling .pio\build\esp32dev\lib92c\libhelix\libhelix-aac\buffers.c.o from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioOutput.h:7, from .pio\libdeps\esp32dev\audio-tools\src/AudioFilter/Equilizer.h:3, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools.h:16, from src\main.cpp:2: .pio\libdeps\esp32dev\audio-tools\src/AudioTools/VolumeControl.h:11:7: note: class audio_tools::VolumeControl class VolumeControl { ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:42:0, from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:135:32: error: reference to 'VolumeControl' is ambiguous class NoVolumeControl : public VolumeControl ^ .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:27:7: note: candidates are: class VolumeControl class VolumeControl ^ In file included from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioStreams.h:8:0, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioOutput.h:7, from .pio\libdeps\esp32dev\audio-tools\src/AudioFilter/Equilizer.h:3, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools.h:16, from src\main.cpp:2: .pio\libdeps\esp32dev\audio-tools\src/AudioTools/VolumeControl.h:11:7: note: class audio_tools::VolumeControl class VolumeControl { ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17:0, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:125:37: error: reference to 'VolumeControl' is ambiguous Compiling .pio\build\esp32dev\lib92c\libhelix\libhelix-aac\dct4.c.o Archiving .pio\build\esp32dev\lib72b\libWiFi.a virtual void set_volume_control(VolumeControl *ptr) ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:42:0, from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:27:7: note: candidates are: class VolumeControl class VolumeControl ^ Compiling .pio\build\esp32dev\lib92c\libhelix\libhelix-aac\decelmnt.c.o In file included from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioStreams.h:8:0, Compiling .pio\build\esp32dev\lib92c\libhelix\libhelix-aac\dequant.c.o from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioOutput.h:7, from .pio\libdeps\esp32dev\audio-tools\src/AudioFilter/Equilizer.h:3, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools.h:16, Compiling .pio\build\esp32dev\lib92c\libhelix\libhelix-aac\fft.c.o from src\main.cpp:2: .pio\libdeps\esp32dev\audio-tools\src/AudioTools/VolumeControl.h:11:7: note: class audio_tools::VolumeControl class VolumeControl { Compiling .pio\build\esp32dev\lib92c\libhelix\libhelix-aac\filefmt.c.o ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17:0, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:125:37: error: 'VolumeControl' has not been declared virtual void set_volume_control(VolumeControl *ptr) ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17:0, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:172:5: error: reference to 'VolumeControl' is ambiguous VolumeControl *volume_control_ptr = nullptr; ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:42:0, from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:27:7: note: candidates are: class VolumeControl class VolumeControl ^ In file included from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioStreams.h:8:0, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioOutput.h:7, from .pio\libdeps\esp32dev\audio-tools\src/AudioFilter/Equilizer.h:3, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools.h:16, from src\main.cpp:2: .pio\libdeps\esp32dev\audio-tools\src/AudioTools/VolumeControl.h:11:7: note: class audio_tools::VolumeControl class VolumeControl { ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17:0, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:198:13: error: reference to 'VolumeControl' is ambiguous virtual VolumeControl *volume_control() ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:42:0, from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/VolumeControl.h:27:7: note: candidates are: class VolumeControl class VolumeControl ^ In file included from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioStreams.h:8:0, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools/AudioOutput.h:7, from .pio\libdeps\esp32dev\audio-tools\src/AudioFilter/Equilizer.h:3, from .pio\libdeps\esp32dev\audio-tools\src/AudioTools.h:16, from src\main.cpp:2: .pio\libdeps\esp32dev\audio-tools\src/AudioTools/VolumeControl.h:11:7: note: class audio_tools::VolumeControl class VolumeControl { ^ In file included from .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPSink.h:17:0, from src\main.cpp:7: .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h: In member function 'virtual void BluetoothA2DPCommon::set_volume_control(int*)': .pio\libdeps\esp32dev\ESP32-A2DP\src/BluetoothA2DPCommon.h:127:9: error: 'volume_control_ptr' was not declared in this scope volume_control_ptr = ptr; ^ In file included from src\main.cpp:8:0: .pio\libdeps\esp32dev\audio-tools\src/AudioLibs/AudioA2DP.h: In member function 'void audio_tools::A2DPStream::begin(audio_tools::A2DPConfig)': .pio\libdeps\esp32dev\audio-tools\src/AudioLibs/AudioA2DP.h:140:20: warning: enumeration value 'UNDEFINED_MODE' not handled in switch [-Wswitch] switch (cfg.mode){ ^ .pio\libdeps\esp32dev\audio-tools\src/AudioLibs/AudioA2DP.h:140:20: warning: enumeration value 'RXTX_MODE' not handled in switch [-Wswitch] *** [.pio\build\esp32dev\src\main.cpp.o] Error 1