Check to make sure that you are using a version of Minecraft that we support: http://prntscr.com/paiq4y. If you are sure you are using a supported version for the client you are trying to launch, shoot us an email over at www.vape.gg/contact/ if you can't figure out how to fix this issue on your own. We cannot offer technical support over the forums, so if you need more help with this you will have to email us.