Deprecated: Return type of Guitarpuzzle_Public_ViewModel_Json::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/p6690/gitarus.com/wp-content/plugins/guitarpuzzle/public/view-models/json.php on line 5

Fatal error: Declaration of Guitarpuzzle_Public_ViewModel_MaterialList::jsonSerialize() must be compatible with Guitarpuzzle_Public_ViewModel_JsonList::jsonSerialize(): mixed in /home/p6690/gitarus.com/wp-content/plugins/guitarpuzzle/public/view-models/material-list.php on line 14