Error with a odea nonconformant arguments

[sergioh99]

I'm trying to solve a ode with a ode45 function but when i run the code i see
the nonconformant arguments error, how can i fix this? Thanks

i=floor(t/dt)+1;
if i<n
a=(hm(i+1)-hm(i))/dt;
b=(hm(i)-a*tiempo(i));
else
a=(hm(i)-hm(i-1))/dt;
b=(hm(i-1)-a*tiempo(i-1));
end
Hm=a*t+b;
dTmdt=(((1-nm)*W)/mm/cpm)-((Hm*Am*(Tm-Tamb))/mm/cpm);
end

Error: starting_stepsize: operator /: nonconformant arguments (op1 is 1x1,
op2 is 0x0)
error: called from
    starting_stepsize at line 55 column 8
    ode45 at line 192 column 25





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