Failed to open the connection

In my web application i am genarating reports. I am using crystal reports 2008 with VS2010 and the database is SQL server 2008. There is no issues genarating reports in my local machine. After i host my application on the server, I am getting error "Failed to open the connection." while i run the report. I have installed crystal report run time files version 13.0.2.

Thanks in advance.