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.
Please tell us the details, otherwise we can’t help. Start by telling us where the image files you were looking for are. And what sort of error did you suffer? If it was an Exception, show us its stack trace and tell us what the line numbers are. Have you set a system classpath (that usually does a lot more harm than good)?
And please not only one thread per question, but also one question per thread. Get the image thing sorted out before you try anything on the mobile. You just get confused if you try too many things simultaneously.