it seems like i cant run any jar files, i have updated java, i can run Start server.bat i also have changed the line in my advanced settings; Enviormental Variables to whatever it is all the help things told me to. when i try to run Minecraft_server.jar i get an error Failed to load Min-Class manifest attribute from C:\Users\...\Desktop\minecraft\minecraft-server.jar. how do i get this working? please help.