laravel 5.6 with MySql gives Symfony \ Component \ HttpKernel \ Exception \ MethodNotAllowedHttpException error - mysql

Question

There are similar questions under this topic, but none of them gave me an answer. I'm a beginner to laravel and trying to learn by myself.
When I try to connect laravel (version 5.6) with MySql it gives this error.
These are the code lines that working with.
CameraController.php
<?php
namespace App\Http\Controllers;
use App\Camera;
use Illuminate\Http\Request;
class CameraController extends Controller{
public function postCamera(Request $request){
$camera = new Camera();
$camera->email = $request->input('email');
$camera->password = $request->input('password');
$camera->save();
return response()->json([
'message'=>$camera
]);
}
}
CreateCamreasTable.php
public function up(){
Schema::create('cameras', function (Blueprint $table) {
$table->increments('id');
$table->timestamps();
$table->text('email');
$table->text('password');
});
}
api.php
Route::post('/addCamera', ['as' => 'Camera', 'uses' => 'CameraController#postCamera']);
user.php
class User extends Authenticatable{
use Notifiable;
protected $fillable = [
'email',
];
protected $hidden = [
'password',
];
}
I couldn't found out what's wrong with my code..
PS- I'm trying with postman app that supports with sending requests and reading responses. what I'm sending is a json object
{
"email" : "rr#gmal.com",
"password" : "fjf"
}
The error that I receive is