FMGguy, I have found the problem, however I have not figured out how to solve it yet.
Something in my theme (it works with other themes) somehow adds one line of space in the beginning of sitemap_index.xml, causing the error. After testing it in Google, it still reads it.
That said, if we can figure out how to remove the space it will work.
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spencerpad on "[Plugin: WordPress SEO by Yoast] XML sitemap putting out parsing error"
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