leo4ever on "[Plugin: WordPress SEO by Yoast] XML sitemap error with latest version 1.4.13"

Same issue here too.Google crawler bot also giving error.Nothing showing in chrome and in firefox this message:

Error loading stylesheet: An XSLT stylesheet does not have an XML mimetype:http://www.ebookdl.org/sitemap.xsl

my sitemap:

http://www.ebookdl.org/sitemap_index.xml