this is my service config. enter image description here this is my rpc config. enter image description here this is error message. enter image description here

  • 1
    You're missing a runtime impl of pallet_mmr it seems Mar 31, 2022 at 5:20
  • 1
    Please don't share screenshots, instead share code snippets with mardown syntax here is how where possible
    – Nuke
    Mar 31, 2022 at 8:57
  • @Purple_Turtle, yes! I fixed it, thanks.
    – 99kies
    Mar 31, 2022 at 10:11

1 Answer 1


You need to implement the MmrRuntimeApi of pallet-mmr-rpc.


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