What is the problem of failed registration when building the XXS platform?

when building the XSS platform, when registering a user, it appears after clicking the submit button. If registration fails, please contact the administrator.
excuse me, what"s going on?

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Php apache mysql windows
Mar.03,2021

database, no database built

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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-64f5-1b31f93-2bdd4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b31f93-2bdd4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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