Problem about [Errno 2] No such file or directory: ':/usr/local/cuda/bin/nvcc'

[tungtungyan]

I installed versions 11-2. but it cannot find.
which nvcc
/usr/local/cuda-11.2/bin/nvcc

the information in .bashrc.
export CUDA_HOME=/usr/local/cuda-11,2
export PATH=/usr/local/cuda-11.2/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/cuda-11.2

Please help