RSS to MySql - Fix My Code

I am trying to store RSS feeds to a MySql database. The data is not going to the database and is giving me an error. I need help fixing this error. I am using this code: [login to view URL] This line is giving me trouble. ----------> if(mysql_num_rows($item_exists)<1) To see error: This is my output: [login to view URL]://www.sec.gov/Archives/edgar/xbrlrss.all.xml&access_key=1234567890 Help me fix this error so I can store these RSS feeds.