[fw-db] Zend_Db_Table_Exception : "A table must have a primary key, but none was found"

hi all
I'm using Zend_Cachefor Zend_Db_Table_Abstract
Sometimes Htay following occurs:
"A table must have a primary key, but none was found"
While I'm have in the my table primary key.
and Refresh the page to be resolved
What Is Problem؟

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