End Note not recognising references

Hi All, 

I have opened a thesis paper that I have been working on and tried to access my references and got an error message: 

This document does not contain any editable citations.  

I have not saved it as plain text or any other format. It is the same document that I have been working on for months.  The same has happened for all other drafts.  So the error is not specific to a single document.  Endnote has worked well up to this point but it just does not seem to recognise the current references.  Is there a fix or do I have to re-enter all the references again and hope it does not happen again?  

Thank you

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