I'm trying to set up my eos enviroment. When I post the system contracts I get this 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 advise?

thanks in advance


is_feature_activated is new intrinsic which is introduced in EOSIO v1.8.x. It would be activated by hard fork, but not yet supported. Use release/1.6.x branch now.


I'm told this will let you continue with the newest versions: https://github.com/EOSIO/eos/issues/7180

  • For editors: I'd like to keep the github issue url and not copy in the instructions. The github issue instructions will potentially change, making anything copied here become out of date. – NorseGaud Jul 20 at 23:58

You can still post system contract but first activate that protocol feature for v1.8.x node:


  1. add eosio::producer_api_plugin
  2. run curl -X POST -d '{"protocol_features_to_activate": ["0ec7e080177b2c02b278d5088611686b49d739925a92d9bfcacd7fc6b74053bd"]}'

If it doesn't work:

  1. run curl -X POST
  2. find feature_digest value for PREACTIVATE_FEATURE
  3. use it in above's curl.

Reference: https://www.jianshu.com/p/99bdf3f908f6

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