Undefined variable: isModal

[marfino3028]

Undefined variable: isModal (View: C:\xampp\htdocs\sebi\simoneb2\resources\views\livewire\beasiswa\index.blade.php)
Php Is Case Sensitive but that variable are same , and then why that erorr ??

livewire/beasiswa/index.php

{
    public $beasiswas,$nama,$deskripsi, $foto, $semester_id, $users_id;
    public $isModal = 0;
    public function render()
    {
        $this->beasiswas = Beasiswa::join('semester', 'beasiswa.semester_id', '=', 'semester.id')
        ->join('users', 'beasiswa.users_id', '=', 'users.id')
        ->select('beasiswa.*', 'semester.nama AS semester', 'users.*')
        ->orderBy('created_at', 'DESC')->Auth::user()->get();
        return view('livewire.beasiswa.index');
    }
    public function create()
    {
        $this->resetFields();
        $this->openModal();
    }
    public function closeModal()
    {
        $this->isModal = false;
    }
    public function openModal()
    {
        $this->isModal = true;
    }
    public function resetFields()
    {
        $this->nama = '';
        $this->deskripsi = '';
        $this->foto = '';
        $this->semester_id = '';
        $this->users_id = '';
    }
    public function store()
    {

        //MEMBUAT VALIDASI

        $validatedData =  $this->validate([

            'nama' => 'required|string',

            'deskripsi' => 'required|string',

            'foto' => 'required|image|mimes:jpeg,png,jpg,gif,svg|max:2048',

            'semester' => 'required'

        ]);

        $validatedData['nama'] = $this->file->store('files', 'public');

        //QUERY UNTUK MENYIMPAN / MEMPERBAHARUI DATA MENGGUNAKAN UPDATEORCREATE

        //DIMANA ID MENJADI UNIQUE ID, JIKA IDNYA TERSEDIA, MAKA UPDATE DATANYA

        //JIKA TIDAK, MAKA TAMBAHKAN DATA BARU

        Beasiswa::updateOrCreate(['id' => $this->users_id], [

            'nama' => $this->nama,

            'deskripsi' => $this->deskripsi,

            'foto' => $this->foto,

            'semester' => $this->semester,

            'id' => $this->id,

        ]);

        //BUAT FLASH SESSION UNTUK MENAMPILKAN ALERT NOTIFIKASI

        session()->flash('message', $this->users_id ? $this->nama . ' Diperbaharui': $this->nama . ' Ditambahkan');

        $this->closeModal(); //TUTUP MODAL

        $this->resetFields(); //DAN BERSIHKAN FIELD

    }

    //FUNGSI INI UNTUK MENGAMBIL DATA DARI DATABASE BERDASARKAN ID MEMBER

    public function edit($id)

    {

        $beasiswa = Beasiswa::find($id); //BUAT QUERY UTK PENGAMBILAN DATA

        //LALU ASSIGN KE DALAM MASING-MASING PROPERTI DATANYA

        $this->users_id = $id;

        $this->nama = $beasiswa->nama;

        $this->deskripsi = $beasiswa->deskripsi;

        $this->foto = $beasiswa->foto;

        $this->semester_id = $beasiswa->semester_id;

        $this->openModal(); //LALU BUKA MODAL

    }

    //FUNGSI INI UNTUK MENGHAPUS DATA

    public function delete($id)

    {

        $beasiswa = Beasiswa::find($id); //BUAT QUERY UNTUK MENGAMBIL DATA BERDASARKAN ID

        $beasiswa->delete(); //LALU HAPUS DATA

        session()->flash('message', $beasiswa->nama . ' Dihapus'); 
    }
}

index.blade.php

<x-slot name="header">
<h2 class="font-semibold text-xl text-gray-800 leading-tight">
    Data Anggota
</h2>

@if (session()->has('message'))

{{ session('message') }}

@endif

        <button wire:click="create()" class="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded my-3">Tambah Anggota</button>
        
        @if($isModal)
            @include('livewire.beasiswa.create')
        @endif

        <table class="table-fixed w-full">
            <thead>
                <tr class="bg-gray-100">
                    <th class="px-4 py-2">Nama</th>
                    <th class="px-4 py-2">Deskripsi</th>
                    <th class="px-4 py-2">Foto</th>
                    <th class="px-4 py-2 w-20">Semester</th>
                    <th class="px-4 py-2">Action</th>
                </tr>
            </thead>
            <tbody>
                @forelse($members as $row)
                    <tr>
                        <td class="border px-4 py-2">{{ $row->nama }}</td>
                        <td class="border px-4 py-2">{{ $row->eskripsi }}</td>
                        <td class="border px-4 py-2">{{ $row->foto }}</td>
                        <td class="border px-4 py-2">{{ $row->semester}}</td>
                        <td class="border px-4 py-2">
                            <button wire:click="edit({{ $row->id }})" class="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded">Edit</button>
                            <button wire:click="delete({{ $row->id }})" class="bg-red-500 hover:bg-red-700 text-white font-bold py-2 px-4 rounded">Hapus</button>
                        </td>
                    </tr>
                @empty
                    <tr>
                        <td class="border px-4 py-2 text-center" colspan="5">Tidak ada data</td>
                    </tr>
                @endforelse
            </tbody>
        </table>
    </div>
</div>