Error:When Runing aprogram in Eclipse

I have used Eclipse to Run/Compile codes, but this time round Am getting this message;Error:A JNI error has occured,please check your installation and try again,When I press ok button also this Message pops up ie.A java Exception has occurred yet my eclipse and java are well set on my windows 7 system.What could be the problem?Next here is what could be the result of my Run codes/compiled program. Thanks