SimpleDeserializer encountered a child element, which is NOT expected, in something it was trying to deserialize

Why am I get the following error, "SimpleDeserializer encountered a child element, which is NOT expected, in something it was trying to deserialize"?

Summary

Why am I get the following error, "SimpleDeserializer encountered a child element, which is NOT expected, in something it was trying to deserialize"?

There can be many reasons why you are recieiving this error, but we will focus on just 2 situations:

1.  You may be getting this error because the given root element in your request xml document does not match any Element Declarations in eBay Schema.

Answer Title: Error 20170 - Schema XML request error
Answer Link: https://ebaydts.com/eBayKBDetails?KBid=897

2.  Another common reason is your <Description> has HTML or XML reserved characters.  For a workaround you want to enclose your description using CDATA.

<![CDATA[ description here ]]>

Description: http://developer.ebay.com/DevZone/XML/docs/Reference/eBay/AddFixedPriceItem.html#Request.Item.Description

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