Error: Class member redefinition has been found

I have been trying to define a resistor which also produces heat in simscape. The code for the .ssc file is depicted below. When I try to insert the component (via library browser: simscape/utilities/simscape component), I get the error: " Error: Class member redefinition has been found." and "Caused by:

Error using MyPackage.heat_producing_resistor> (line 10)

Class member 'h' is defined.

Error using MyPackage.heat_producing_resistor> (line 16)

Class member 'h' is defined"

What is the problem?

Am i not authorised to define an output?

Is the fault in foundation.electrical.electrical(I don`t understad what that means and if it should be defined differently and why)?

Thanks in advance

component heat_producing_resistor
    %linear resistor
    %Follows the relation U=I*R [V]
    %Includes the heat produced in the resistor dQ/dt =u(t)*i(t) [J/s = W]
    %R is assumed to be constant
    
    nodes
        p = foundation.electrical.electrical; % +:left
        n = foundation.electrical.electrical; % -:right
        dQ = foundation.electical.electrical; % Q:right
    end
    
    variables
        i = {0, 'A' };      %Current (through)
        u = {0, 'V' };      %Voltage (across)
        dQ = {0, 'W' };  %Heatflow (across)
    end
    
    parameters
        R = {1, 'Ohm' };    %resistance
    end
    
    branches
        i : p.i -> n.i;
    end
    
    equations
        assert(R>0)
        v == p.v - n.v;
        v == i*R;
        dQ == i*v;
    end

end