Octave does not install package

[layers]

I am using QtOctave, but I need the symbolic package. So I go to Config>install Octave Packages and then I search symbolic and check mark it, and then I click Apply changes, it says process finished, but if I go back into Install Octave Packages, and search for Symbolic, there is no check mark for installed. Also, it does not understand the command "syms s t". How would I fix this?

[waspbr]

better late than never.

the symbolic command for octave is

sym("x")