Guzzlehttp/PSR-7 fails combined with slim 3 framework

[dquak]

Hi, When trying to use the following module, I come across the following error coming from Slim 3:

{
"code": 0,
"message": "Middleware must return instance of \Psr\Http\Message\ResponseInterface",
"file": "C:\wamp64\www\test\vendor\slim\slim\Slim\MiddlewareAwareTrait.php",
"line": 75,
"trace": [
"#0 C:\wamp64\www\ff-api-php\vendor\slim\slim\Slim\MiddlewareAwareTrait.php(122): Slim\Route->Slim\{closure}(Object(Slim\Http\Request), Object(Slim\Http\Response))",
"#1 C:\wamp64\www\ff-api-php\vendor\slim\slim\Slim\Route.php(316): Slim\Route->callMiddlewareStack(Object(Slim\Http\Request), Object(Slim\Http\Response))",
"#2 C:\wamp64\www\ff-api-php\vendor\slim\slim\Slim\App.php(476): Slim\Route->run(Object(Slim\Http\Request), Object(Slim\Http\Response))",
"#3 C:\wamp64\www\ff-api-php\vendor\slim\slim\Slim\MiddlewareAwareTrait.php(122): Slim\App->__invoke(Object(Slim\Http\Request), Object(Slim\Http\Response))",
"#4 C:\wamp64\www\ff-api-php\vendor\slim\slim\Slim\App.php(370): Slim\App->callMiddlewareStack(Object(Slim\Http\Request), Object(Slim\Http\Response))",
"#5 C:\wamp64\www\ff-api-php\vendor\slim\slim\Slim\App.php(295): Slim\App->process(Object(Slim\Http\Request), Object(Slim\Http\Response))",
"#6 C:\wamp64\www\ff-api-php\app\server.php(34): Slim\App->run()",
"#7 C:\wamp64\www\ff-api-php\public\index.php(7): require('C:\\wamp64\\www\\v...')",
"#8 {main}"
]
}

It seem that something with the guzzle Http PSR-7 makes the slim to having problems,
Any idea?

[SachinAgarwal1337]

@itay9001 This seems to be a slim framework problem. Sorry but there is nothing much I can do. You can probably try slim forums to ask about this.