[chuck-users] unexpected ADSR arg assignment errors

If I type this: ADSR env; 2.0 => env.attackTime; I get this error: [Untitled 2]:line(2): arguments type(s) do not match: [Untitled 2]:line(2): ... for function 'ADSR.attackTime(...)' ... [Untitled 2]:line(2): ...(please check the argument types) Even though the docs define attackTime for ADSR as a float: .attackTime - ( float , WRITE only ) - attack time Why? thanks again, jascha