Solve a triple integral

Hello everyone. I would like to solve a triple integral. To do this, I have defined the function:

Function integrating = function (x, y,z) Syms x and z Global gv MB0 kappa Til hbarra Lc sigma mc mv cteB T Vds b SF SE fB fT e

B = gv * e * MB0 * MB0 * exp (-2 * kappa * Til) / (4 * pi ^ 3 * hbarra); % C · eV2 / eV · s (1) (2 * mv * x ^ 2 / hbarra ^ 2 + 2 * mc * y ^ 2 / hbarra ^ 2-4 * sqrt (mc * mv) * x * y * Cos (z)) Lc * Lc). (3/2); % M ^ 2 SE = exp ((x-y) ^ 2 / (sigma ^ 2)) / (sqrt (pi * sigma)); % 1 / eV FB = 1 ./ (exp (x / (cteB * T) + 1); % Without units FT = 1 ./ (exp ((x-Vds) / (cteB * T) + 1); % Without units

Integrating = b * SF * SE * (fB-fT);

And then I do:

For i = 1: 17     Sol (i) = integral3(function, Ect (i), inf, -inf, Evb (i), 0.2 * pi); End

Where Ect and Evb is a vector I have defined above.

It gives me the following error and I do not know what I'm doing wrong:

Error using integralCalc/finalInputChecks (line 511) Input function must return 'double' or 'single' values. Found 'sym'.

. . .

Thank you very much for your help.