using ilaplace in conjunction with rltool

Question

Using Matlab, I have the following code:

s = tf('s')
K=0.5;
H= 1/(s*(s+2));
Hcl=feedback(K*H,1)
ilaplace(Hcl)
rltool(H)

When I run this code, Matlab gives an error about ilaplace:

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

Can someone help me how to use ilaplace and rltool concurrently