This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
An Exception is throwing when i try to take the response of it
The stack trace from this exception should tell you which method in which class is throwing the IllegalArgument exception. The source code for that method should indicate what the argument is supposed to be.