I installed Linphone 4.0 on my Windows desktop, but I get the following error 
when I try to start it:
"""
Failed to create OpenGL context for format QSurfaceFormat(version 2.0, options 
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8, 
greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, 
samples -1, swapBehavior QSurfaceFormat::SwapBehavior(DoubleBuffer), 
swapInterval 1, profile QSurfaceFormat::OpenGLContextProfile(NoProfile)) .
This is most likely caused by not having the necessary graphics drivers 
installed.
Install a driver providing OpenGL 2.0 or higher, or, if this is not possible, 
make sure the ANGLE Open GL ES 2.0 emulation libraries (libEGL.dll, 
libGLESv2.dll and d3dcompiler_*.dll) are available in the application 
executable's directory or in a location listed in PATH.
"""
I checked the "bin" folder of Linphone and I can see libEGL.dll, libGLESV2.dll, 
and D3Dcompiler_47.dll. So why is the error still happening?
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