It had $sth->bind_param(1,@$->[0]); 
I have been trying to find out what the error is and hence following tons of tricks available online and thats why I had changed it to $->[0] instead of @$->[0] <br/>

even then it gave me the same error.<br>

Thanks.
yes. maybe an understanding as to what causes this error also will be helpful..  one link said that its may happen if there are two sub routines and they are unordered.. I didn't quite understand what that meant.. Thats why I posted my whole code here.