Error on my document when opening

Hi there
I have yesterday completed a uni assessment. I went to upload it when the following error occurred on both my PC and USB copy;

File format error found at
SAXParseException: '[word/document.xml line 2]: Attribute w:cstheme redefined
', Stream ‘word/document.xml’, Line 2, Column 37128(row,col).

Can I retrieve this document?
Thank you
PS I do not understand the Tags you require