'uid' => 'string'

app/Models/GroupInfo.php

@@ -8,4 +8,8 @@ use Illuminate\Database\Eloquent\Model;
 class GroupInfo extends Model
 {
     use HasFactory;
+    protected $primaryKey = 'uid';
+	protected $casts = [
+		'uid' => 'string'
+	];
 }