I am using MMA 12.3.1 on Ubuntu 18.04, and my license support parallelization. The default kernel is Local and I create another one named newKernel. when I launch MMA and choose Local to perform some calculation with parallelization it is working fine. Now if I open new notebook and choose newKernal to do different calculation that also includes parallelization I get this error.
"Unable to communicate with closed link \ LinkObject[\!\(\"/usr/local/Wolfram/Mathematica/12.3/Executables/\ wolfram -noinit -subkernel -pacletreadonly -wstp\"\),125,4]"
Note that If I restart MMA and run the first code with newKernal it is working fine, but when I run the second code on Local I get the same error.
I tried to uninstall MMA and reinstall again and restart my computer but could not get rid of this. any help please?
For a minimal example one can use any simple code with