Yesterday, a bird tweeted me that there is a new Forge update available, namely 10.13.0.1180, so I updated my workspace to the latest recommended version by the corresponding tutorial in Forge's Wiki. However, as I updated my 1.7.2 mods today and wanted to run the client it didn't even show the Minecraft window; literally no sign of life when I tried to launch it. The only thing I saw in the system log was that the LaunchWrapper class tried to launch the main class, but it failed as it can be seen from the recent log.
I seriously don't know where to start since this is the first time this error occured. Any recommendations on how to fix this issue?