When element-tree inserts a node, only the last layer can be inserted.

when element-tree inserts a node, only the last layer can insert
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the red one inserts the data but not the node, and the rest can insert the node

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Nov.03,2021
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-64f5-1b3253f-2bdea.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3253f-2bdea.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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