Check for missing argument or incorrect argument data type in call to function 'pole'."

Q

Q =

[-(s^2 + (9*s)/10 + 392/225)/(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000), -(s + 9/10)/(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000), 196/(125*(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000))]

[ -((221*s)/100 + 1989/1000)/(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000), -(s^2 + (9*s)/10)/(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000), (196*s)/(125*(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000))]

[ -221/(90*(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000)), -(10*s)/(9*(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000)), -(s^2 - 221/100)/(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000)]

G

G =

882/(625*(- s^3 - (9*s^2)/10 + (421*s)/900 + 1989/1000))

p=pole(G)

%Here G is my transfer function, I am trying to find the poles of tf using pole function, but gettin a message ="Check for missing argument or incorrect argument data type in call to function 'pole'.

"

%Can anyone tell me what is the error, as I am new to MATLAB