Why does my less & symbol no longer work?

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used to write this all the time, but recently it suddenly didn"t work. Ask the boss for advice

Nov.21,2021

less doesn't know, but there's nothing wrong with sass writing that way

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-64f5-1bf3b3c-31eaa.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf3b3c-31eaa.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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