I guess that you have exported the bash variable CP to /home/oscar/Documents/LatexFiles/UTFSM/Papers, that Sage understands that you are setting an alternative to the cp command. Hence, you should type unset CP before compiling Sage (in the same terminal, this is only a local effect).
I guess that you have exported the bash variable CP to /home/oscar/Documents/LatexFiles/UTFSM/Papers, that Sage understands that you are setting an alternative to the cp command. Hence, you should type unset CP before compiling Sage (in the same terminal, shell, this is only a local effect).