510559 wordpress post error issue

I have wordpress gallery website but when i add a site getting error and gallery not working [login to view URL] please check and let me know who can fix this error Fatal error: Call to undefined function xmlrpc_encode_request() in /home/cssnackc/public_html/wp-content/themes/cssnack/bin/[login to view URL] on line 77 My budget is max. $50 I want to add image upload option in add-a-site form also