Associate Action doesn't work

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;

class School extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
    ];

    public function students(): HasMany
    {
        return $this->hasMany(Student::class);
    }
}

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class Student extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
        'school_id',
    ];

    public function school(): BelongsTo
    {
        return $this->belongsTo(School::class);
    }
}

Call to undefined method App\Models\Student::schools()