Laravel undefined variable in view, Laravel 5.2 using AdminLTE

I am getting an error in laravel 5.2 on the telegram view with an undefined variable posts. I am using AdminLTE templates and here is my code so far:

on my Controller:

public function storeMessage(Request $request)
    {
        $request->validate([
            'email' => 'required|email',
            'message' => 'required'
        ]);

        $text = "[HEADLINE] Informasi Portal Beasiswa\n"
            . "<b>Email Address: </b>\n"
            . "$request->email\n"
            . "<b>Message: </b>\n"
            . $request->message;

        Telegram::sendMessage([
            'chat_id' => env('TELEGRAM_CHANNEL_ID', ''),
            'parse_mode' => 'HTML',
            'text' => $text
        ]);

        return redirect('beasiswa');
    }

and my error like bellow: enter image description here

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