How to repair Endnote liabrary?

Hi, is anynoe who knows how to deal with the damaged library.I copied my endnote library to anthor place and then open it, select some references in the copied library and then open  to the original  library, imported the selected references to the original library.  then the library collapsed. when I using the recover library in the main menu. But 0 references is recovered. even I recover the copied library. it can’t repair it.  is anybody who knows some other ways I can try to repair the library. Many Thanks in advance.

it seems that the Endnote X3 is not so stable.

Usually, when I find full text for a first article. and I can’t continue to find another article. the software would pop up an message to ask me to reopen Endnote.