未解决！Discuz System Error、fetch_all_by_navtype_type、PHP Debug

Discuz! System ErrorClass "table_common_nav" does not have a method named "fetch_all_by_navtype_type".
PHP Debug

No.	File	Line	Code
1	admin.php	57	require(%s)
2	source/admincp/admincp_forums.php	61	showforum(Array, %s, %s, false)
3	source/admincp/admincp_forums.php	2055	table_common_nav->fetch_all_by_navtype_type(%d, %d)
4	source/admincp/admincp_forums.php	2055	discuz_base->__call(%s, Array)
5	source/class/discuz/discuz_base.php	44	break()

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