matlab found an internal error (please help)

i keep getting this error whenever i import an excel file but out of the multiples that i import only two gave me this message here is my code

    if true
      % code
    end
function Force = PlantearEquilibrio(Nod,PosX,PosY,Con,Rest,Load)
x = size(Nod);
y = x(1);
t = size(Con);
u = t(1);
cont = 0;
for e = 1:length(Rest)
    for t = 1:2        
        Rest(e,t);
        if Rest(e,t) ~= 0
            cont = cont + 1;
        end
    end
end
matr = zeros(2*y,(u + cont));
fuerzas = zeros((u + cont),6);
w = 1;
while w < u +1
    angulo = atan(((PosY(Con(w,2))-PosY(Con(w,1)))/(PosX(Con(w,2))-PosX(Con(w,1)))))*180/pi;
    matr(2*(Con(w,1))-1,w) = cos(angulo*pi/180);
    matr(2*(Con(w,2))-1,w) = -cos(angulo*pi/180);
    matr(2*(Con(w,1)),w) = sin(angulo*pi/180);
    matr(2*(Con(w,2)),w) = -sin(angulo*pi/180);
    w = w + 1;
end
q = 1;
s = w;
while q < y + 1 
    if Rest(q,1) ~= 0 
        matr((2*Nod(q,1))-1,s) = Rest(q,1);
        s = s + 1;
        q = q + 1;
    else
        q = q + 1;
    end
end   
q = 1;
while q < y + 1   
    if Rest(q,2) ~= 0 
        matr(2*(Nod(q,1)),s) = Rest(q,2);
        s = s + 1;
        q = q + 1;
    else
        q = q + 1;
    end
end
carga = zeros(2*(length(Load)),1);
p = 1;
for e = 1:length(Load)
    for a = 1:2
        Load(e,a);
        carga(p,1) = Load(e,a);
        p = p + 1;
    end
end
Force = matr\carga;

end

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Answer 1

[joaquin tellez]

 here is the other code in which i open the excel file

 if true
    % code
  end
arc = input('ingrese el nombre de su excel: ','s');
Nod = xlsread(strcat(arc,'.xlsx'));
PosX = xlsread(strcat(arc,'.xlsx'),2);
PosY = xlsread(strcat(arc,'.xlsx'),3);
Con = xlsread(strcat(arc,'.xlsx'),4);
Rest = xlsread(strcat(arc,'.xlsx'),5);
Load = xlsread(strcat(arc,'.xlsx'),6);

Force = PlantearEquilibrio(Nod,PosX,PosY,Con,Rest,Load) GraficarSolucion(PosX,PosY,Force,Con)