XML parsing in python: expaterror not well-formed -


I use Python xml.etree.ElementTree to parsing some XML on a file I am doing However, I get this error through the document: 

  xml.parsers.expat.ExpatError: not well (invalid token): line X, column Y   
 So I go to line X, column Y, and I see an ampersand (& amp;) with highlighting on red background. what does this mean?  
 Its preceding two letters are  & gt; & Gt; , so that the  & gt; & Gt; & Amp; Is something special about ?  
 How does anyone decide on this?   
 
 
 The & amp; There is a special character in XML, which is used for character organizations. If your XML contains & amp;  & amp; Amp; Amp;  or  & amp; # 1104;  or not as part of an entity like the choice, the XML is invalid.

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