Exchange Request Exception

{
    "title": "CodeIgniter\\Exceptions\\PageNotFoundException",
    "type": "CodeIgniter\\Exceptions\\PageNotFoundException",
    "code": 404,
    "message": "Controller or its method is not found: \\App\\Controllers\\Api\\ExchangeController::exchangeGoods",
    "file": "/var/www/html/opoapi/vendor/codeigniter4/framework/system/Exceptions/PageNotFoundException.php",
    "line": 14,
    "trace": [
        {
            "file": "/var/www/html/opoapi/vendor/codeigniter4/framework/system/CodeIgniter.php",
            "line": 985,
            "function": "forPageNotFound",
            "class": "CodeIgniter\\Exceptions\\PageNotFoundException",
            "type": "::",
            "args": [
                "Controller or its method is not found: \\App\\Controllers\\Api\\ExchangeController::exchangeGoods"
            ]
        },
        {
            "file": "/var/www/html/opoapi/vendor/codeigniter4/framework/system/CodeIgniter.php",
            "line": 328,
            "function": "display404errors",
            "class": "CodeIgniter\\CodeIgniter",
            "type": "->",
            "args": [
                {}
            ]
        },
        {
            "file": "/var/www/html/opoapi/public/index.php",
            "line": 52,
            "function": "run",
            "class": "CodeIgniter\\CodeIgniter",
            "type": "->",
            "args": []
        }
    ]
}