MC Error Java

So hey guys i got this error from Java Virtual Machine Launcher(with Minecraft) : could not find the main class: net.minecraft.launcherframe. Program will exit. can anybody plz help me fix this error ?

-Thanks

Try running it again. If your running the updater client, it does it to me too. Just keep trying to run it and it will eventually work. Try updating your java, and using the JDK instead of the JRE.

unistall JRE ? and then download JDK?
still getting the error with JDK and with MC my MC screen gets black and cant play then ... in game