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i'm facing a problem with coding the migration.sol how i can fix these error space!

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pragma solidity ^0.4.24;


contract Migrations {
    address public owner;
    uint public last_completed_migration;

    modifier restricted() {
        if (msg.sender == owner) _;
    }

    constructor() public {
    owner = msg.sender;
}

function setCompleted(uint completed) public restricted {
last_completed_migration = completed;}


function upgrade(address new_address) public restricted {
    Migrations upgraded = Migrations(new_address);
    upgraded.setCompleted(last_completed_migration);
  }
}