error occured when redirect blade file in Laravel 5.2

need redirect to collaborates blade file after form data saving in projectcontroller

 $project->save();

        return redirect()->route('projects.collaborators')->with('info','Your Project has been created successfully');
    }

routes is this

Route::get('/collaborators', function(){
    return view('projects.collaborators');
});

collaborators blade file is in projects folder in view file.

but occured this error message

Route [projects.collaborators] not defined.

how to fix this problem

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