Endnote CWYW word plug-in doesn't recognize any reference previously inserted in a .doc

Hello everyboy.

I was using the ENDNOTE CWYW with Microsoft  Office Word 2007. During some weeks I was introducing several references into a manuscript. However, today ENDNOTE don’t recognize the references previously inserted in the .doc and when I insert a new reference in the .doc it appears as “1”.  When I tried to “Edit references”, next message appears: “This document does not contain any editable citations. Citations must be formatted to use the Edit Citations Tool”.

Anyone could help me?

Thank you in advance.