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 ]]>