1、 Query contract account balance （address(this).balance） Report errors

In their own Geth When querying the contract account balance on the private chain, there is an error , But use Remix Of Javascript VM Normal during execution , Use the test network Goerli It's normal , Be able to view the contract balance .

（1） Execute function

    // Query contract account balance , Use view Modifier 
    function getContractAccountBalance() public view returns (uint256){
        return address(this).balance;  //this Is the object of this contract 
    }

（2） error message

call to functionModifier.getContractAccountBalance

call to functionModifier.getContractAccountBalance errored: Internal JSON-RPC error.
{
  "code": -32000,
  "message": "invalid opcode: SELFBALANCE"
}

  As shown in the figure ：

（3） Solution

stay genesis.json Medium config increase ”istanbulBlock“ Set up , As shown below ：

{
  "config": {
    "chainId": 1422,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock":0,
    "ethash": {}
  },
  "difficulty": "1",
  "gasLimit": "8000000",
  "alloc": {
    "7df9a875a174b3bc565e6424a0050ebc1b2d1d82": { "balance": "300000" },
    "f41c74c9ae680c1aa78f42e5647a62f353b7bdde": { "balance": "400000" }
  }
}

Close all nodes , Rerun init Command enables the new chain configuration . Tested , You can query the contract account balance normally

May refer to ：blockchain - Geth private network return error "invalid opcode: SELFBALANCE" when executing a simple contract - Stack Overflow

Or official website ：Private Networks | Go Ethereum