i just trying to setup my eos enviroment ,  when i post the system contracts i got the error msg:

Error 3070000: WASM Exception
Error Details:
env.is_feature_activated unresolveable

enviroment: 
ubuntu 18
eos: v1.8.1
cdt: v1.8.1
sys contracts: 1.7.0

can someone has an advise?

thanks in advise