Application won't start Mac OS X

I have installed Sikuli on my Mac. However, the application immediately quits when trying to start with the error message "To view this web content, you need to install the Java Runtime Environment". I have a Mac with OS X Yosemite Version 10.10.2 and already have Java installed. I have the newest version of Java installed, Java Version 8 Update 40. I have Java installed, but still get the message. What do I need to do to start Sikuli?