error "inputs must be float"

i cant get past this ode45 because of this

>> initial = [0.2,0.3];

>> timespan

timespan =

0 20

>> initial

initial =

0.2000 0.3000

>> [x1 x2] = ode45(@(x11,x22)x1diff(time,x11,x22),timespan,initial);

Error using odearguments (line 113)

Inputs must be floats, namely single or double.

Error in ode45 (line 115)

odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);

please help

[madhan ravi]

upload your equations in latex form

[agrim agarwal]

gud now?