Close InCopy and the file you're currently working with.
When working with random InCopy documents (Old/New), checking In and checking Out at certain intervals causes corruption in the underlying structure of these icml files. This corruption occurs due to an extra <xml></xml> node is automatically added at uncertain location within an icml document.
To fix these corrupt InCopy documents follow below steps
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Download UltraEdit or TextEdit on Mac/Windows. 
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Open the corrupted icml file within TextEdit/UltraEdit 
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Press Ctrl+F to start finding the node entry: <?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
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When a second entry of this exact node entry: <?xml version="1.0" encoding="UTF-8" standalone="yes"?> is found, delete the text starting from the second instance of tag <?xml version="1.0" encoding="UTF-8" standalone="yes"?> and deleting till the first instance of tag </Document> 
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Save the icml file and open the icml file within InCopy or place it within InDesign to continue working with the document.