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Unlocking Ethereum wallet using Geth JSON-RPC

When I use ETH with JSON-RPC I have error “message”: “authentication needed: password or unlock» and If I manually unlock I have other error “message”: “insufficient funds for gas * price + value” Any ideas???? POST request

What is Internal JSON-RPC error. { "code": -32000, "message": "invalid opcode: CHAINID" }

I have deployed a new EVM based blockchain using geth, and deployed an ERC20 token on it successfully but when I tried to deploy an ERC20 token for voting purposes on governance contract I faced with the error and also getting same error with governance contract. creation of MyToken errored: Internal JSON-RPC error. { "code":::Listen

I have deployed a new EVM based blockchain using geth, and deployed an ERC20 token on it successfully but when I tried to deploy an ERC20 token for voting purposes on governance contract I faced with the error and also getting same error with governance contract.

creation of MyToken errored: Internal JSON-RPC error. {   "code": -32000,   "message": "invalid opcode: CHAINID" } 

Unlocking Ethereum wallet using Geth JSON-RPC

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