I've been trying to start up a new modded minecraft server, but when I go in the world by using my vanilla 1.7.10 jar file I can't place down any blocks from my mods. So I looked up the problem and decided to use my 1.7.10 universal .jar file to start up my server, it started to work at first but then after it opened for a little while it closed itself on it's own. I did this a couple of times and it kept happening, then I started up my computer and now I can't even open the universal file at all and I don't know why or how to fix it. Please help T-T. Every time I try to open it I just get this message; "The Java JAR file "forge-1.7.10-10.13.4.1614-1.7.10-universal.jar" could not be launched. Check the Console for possible error messages."