Hi, thanks for reply.I disabled all plugins but still the same error.
Strange thing is, even though I am getting this error but when submitted to Google & Bing webmaster, they are able to read it as tells me how many links are submitted in sitemap. (I think it works in IE though).
I am using Expedia Support Plugin, GZip Ninja Speed Compression, Material Admin Theme, Page Links To, WordPress HTTPS, WordPress Importer, Yoast SEO (with sitemap disabled).
Thanks