Sat Jan 2 07:38:44 2021 - ERROR: Compiled with the flag for AVX but not supported by the CPU.
Does your system support AVX?
https://aur.archlinux.org/packages/coppeliasim/ is only rebundling an upstream provided bundle. You could try building https://github.com/CoppeliaRobotics/CoppeliaSimLib although it looks to have lots of sub-projects and it may be the last one mentioned DynamicsVortex https://github.com/CoppeliaRobotics/simExtDynamics required AVX instead of the main binary.
Edit:
$ grep AVX -rl .
./libopencv_imgcodecs.so.4.0.1
./libQt5XcbQpa.so.5.12.5
./libVxCore.so.2020.3.0.68
./programming/b0RemoteApiBindings/cpp/msgpack-c/include/msgpack/predef/hardware/simd/x86/versions.h
./programming/b0RemoteApiBindings/cpp/msgpack-c/include/msgpack/predef/hardware/simd/x86.h
./libopencv_core.so.4.0.1
./libVxPlatform.so.2020.3.0.68
./libopencv_imgproc.so.4.0.1
Why is the AUR package listing the license as LGPL while it is bundling the Edu version which uses a custom license?
libopencv_imgcodecs.so.4.0.1
libopencv_core.so.4.0.1
libopencv_imgproc.so.4.0.1
Looks to be opencv as bundled is built with AVX enabled. See the Arch opencv package which I believe disables use of AVX.
libQt5XcbQpa.so.5.12.5
qt5-base
libVxCore.so.2020.3.0.68
libVxPlatform.so.2020.3.0.68
some part of coppeliasim
Error: signal 11:
/usr/share/coppeliasim/libcoppeliaSim.so(_Z11_segHandleri+0x30)[0x7ff2d2839ae0]
/usr/lib/libc.so.6(+0x3d6a0)[0x7ff2d57396a0]
/usr/share/coppeliasim/libVxPlatform.so.2020.3(+0x2bdf4)[0x7ff2bc6d9df4]
/usr/share/coppeliasim/libVxPlatform.so.2020.3(_ZN2Vx8LogErrorEPKcz+0x9d)[0x7ff2bc6da20d]
/usr/share/coppeliasim/libVxPlatform.so.2020.3(+0x20e37)[0x7ff2bc6cee37]
/lib64/ld-linux-x86-64.so.2(+0x112de)[0x7ff2d63d72de]
/lib64/ld-linux-x86-64.so.2(+0x113c8)[0x7ff2d63d73c8]
/usr/lib/libc.so.6(_dl_catch_exception+0xe5)[0x7ff2d58370e5]
/lib64/ld-linux-x86-64.so.2(+0x15705)[0x7ff2d63db705]
/usr/lib/libc.so.6(_dl_catch_exception+0x88)[0x7ff2d5837088]