Parity PoA Test chain

I’m experimenting with setting up a test PoA chain using Parity v2.7.3.
After deploying contracts on this network, when I call the methods, I get the below error from RPC.

      "code": -32602,
      "message": "Unknown block number"

Is this related to the params in the chain spec?


Do I have any EIP transition missing which is causing this issue?

@zemse What exactly method do you call?