ios - Upgrading to Swfit 3: cannot override 'init' which has been marked unavailable -

i inherited ios project incorporates apple's researchkit (rk).

i have upgraded recent version of rk , swift 3. while have worked in ios , rk, still not confident. anyways, there class called surveytask implements orkorderedtask rk.

cannot override 'init' has been marked unavailable

at end function, stepz defined, have:

super.init(identifier: "survey", steps: stepz) 

i checked orkorderedtask class definition, has init function.

i have been reading initializers haven't found anything. using override or convenience before init in surveytask doesn't change anything. same error. appreciated.

xcode version 8.1.