Question: Error, (in DEtools/phaseportrait) the 'number' option must be specified before initial conditions

I'm trying out this example code, which I have succesfully used before, but now it's giving me this error. I tried with the simplest example, but i still get the error. One answer to this topic was an "extra space" in the definitions, but i've checked with and without spaces and i still can't find what is wrong... Anyone has any ideas?
thank you

> with(DEtools):
> ode1 := d*x(t)/dt = x(t);

                         d x(t)       
                         ------ = x(t)
                           dt         
> ode2 := d*y(t)/dt = -y(t);

                         d y(t)        
                         ------ = -y(t)
                           dt          
> phaseportrait([ode1, ode2], [x(t), y(t)], t = 0 .. 100, [[x(0) = 2, y(0) = 1], [x(0) = 1, y(0) = 2]], stepsize = 0.02, colour = grey, linecolour = black);

Error, (in DEtools/phaseportrait) the 'number' option must be specified before initial conditions