[Ethereum] How to transfer eth to specific address in smart contract

I want to send eth to specific amount by calling smart contract.

This is my contract.

pragma solidity ^0.6.7;

contract MyContract { 　　
　　address payable receiver;

    constructor(address _icb_address) public {
        receiver = msg.sender;
    }

    function sendEther(uint _amount) public returns(bool success) {
        receiver.transfer(_amount);
        success = true;
    }

}

I called endEther from an address which is not same as receiver, but I got this error.
gas required exceeds allowance (10000000) or always failing transaction

This is failed transaction on etherscan.
https://rinkeby.etherscan.io/tx/0x5652cad647ee5146cdb1e2e97f8376075a630e98021e0927cb629ed0efbe1099

It seems like transfer function is called from contract.
I couldn't understand why this function is executed by contract address not msg.sender.

How to send eth to spesific address on smart contract?
Could you give me any advise, please?