SharePoint 2013 Search and parser errors

One subsite in my SP environment, with xml-files stored. The crawl throws this error, 30k times,

Processing this item failed because of a xml parser error

I tried to do the steps from this guide, http://ift.tt/1Ch57jh , but it did not work for me.

I also have a small amount of word parser error and pdf parser errors.

Here is the whole error:

Processing this item faild because of a XML error. (Error parsing document 'http://mySPSite/mySubsite/myList/theNameOfTheXMLFile.xml'. Invalid XML stream - line (6), position (19). ;; SearchID = number of the search id)

They all has the "line (6)" and the "position (19)".

What is the reason for those errors?

This is my crawllog, it recrawls even if it is incremental and full seems to have sucesfully ended.