Fatal error: Uncaught Error: Interface "League\Csv\Serializer\SerializationFailed" not found in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\league\csv\src\Serializer\MappingFailed.php:21 Stack trace: #0 {main} thrown in C:\Servers\htdocs\inventory.fitzalan.co.uk\vendor\league\csv\src\Serializer\MappingFailed.php on line 21