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Then we went according to Google guidelines If you have a large site with more than 50,000 URLs, you should create multiple Sitemap's and submit a sitemap index file.
So we changed it as,
renamed sitemap.xml, sitemap1.xml and sitemap1.xml, sitemap2.xml
created sitemap index page with sitemap filename(added sitemap1 & sitemap2 in this page)
<?xml version="1.0" encoding="UTF-8"?>
As to surprise Google Webmaster tools is showing Errors in sitemap1, sitemap2.
So we did replace as it was before, renamed sitemap1, sitemap2 to sitemap, sitemap1(Previous pages).
Worst thing it now still is showing "Error"
Please help me, What i should do....
Sitemaps only assist Google and the other search engines in discovering new pages. If you have your pages interlinked and have many other websites linking to you then you probably do not even need a sitemap. Please remember that simply having a sitemap does not guarantee the search engines will index your pages. They may feel that some of your pages do not have enough value to their users (since it is very hard to have over 50,000 pages that are valuable to search engine users).
I would suggest you run all of your sitemaps through a sitemap validator. That is probably the easiest way of finding any and all issues. Good luck.