MATLAB 7.0 display an error message

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MATLAB Program：

    syms  x y  z b c Y  

    a1 = 1;
    a2 = 1;
    e1  = 9;
    e2 = 7;
    f1 = 56
    f2 =98;
    g1 = 76;
    g2 = 665;

    % a = a1+a2;
    % e = e1+e2;
    % f = f1+f2;
    % g = g1+g2;

    e = 1;
    f = 1;
    g = 1;
    a = 1;

    %
    solve(diff(x) == z-y+b*c-c*y-y^2-c*y-c-e-f-g,...

    diff(y)==x-z+b*z-y^2-c^2-c*y-e*f-g,...

    diff(z) == y-x+c*x-b*z+z+b+e*g+f,...

    0==b*c+y*z+e*f+e*g-Y,...

    diff(b) == a*c+x*z+z+e*f*g*Y,...

    diff(c) == a*b+x*y-e*f*x-y^2*c-y*c^2-e*f-f*g,...

    x, y , z ,b ,c, Y)

Do you think the Matlab program is correct? Someone insisting it is right.

Could solutions be obtained by using the solve() function？