PHP Fatal error: Uncaught Error: Class not found in?

What does Fatal error: Uncaught Error: Class" EndroidQrCodeQrCode" not found in mean in

PHP?
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Php
Mar.23,2021

require('./vendor/autoload.php');
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-7ac559-1dfe8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-7ac559-1dfe8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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