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Haie Alagappan Chidambaram
Yeah, the error is due to paraview so you can download the latest version of paraview which I think is paraview 5.10. then put in a directory where you want to install it then use tar -xvzf ParaView-5.rQQzmGN0.10.1-MPI-Linux-Python3.9-x86_64.tar.gz to extract it.
Then once its extracted you can directly go to the bin folder which is inside extracted folder ParaView-5.rQQzmGN0.10.1-MPI-Linux-Python3.9-x86_64 .You can do cd bin there you will have paraview executable you can run it by using ./paraview.
So after running a case if you type paraview this wont work for that you have to add the paraview path in bashrc sourcing. What you can do now is whenever you want to use paraview go to the downloaded location then add go to bin folder and type ./paraview and browse for the file you want to open. Will have a support call if it’s not happening.
Paraview Opacity Issue is mainly because OpenFOAM default installs older version of 5.4 of paraview.