在ADS中创建电路符号时一直出现这个问题，求达人指点！不胜感激！

Please select a different design.
hpeesofbrowser
error receiving server message
(de_init_iteminfo) D:\ADS2005data\amplifer_prj\networks\bjt-dc
An instance of a design cannot be placed within itself, nor within a design
that is part of its hierarchy.
Please select a different design.
hpeesofbrowser
error receiving server message

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