what do u mean entry clearance corrected if any error,what does it means,where i can process that way my documents,i have left only 10 days to more to expire my visa,please give me a urgent reply

Dear sir, i am hamthoon,i am a srilankan nationality student ,i arrive uk on FEB 2010, i am studding BA ,course duration is 18 month,but i got only 9 month visa which going to expired on 28th NOV 2010.i dont have enough money to renew my visa,and go back my country as well,i have spend lots of money ...