I've tried a number of times to build and run the example mod and keep encountering the same error. I've tried switching JVMs, redownloading the Forge MDK, and restarting my laptop. I followed the steps to start modding available here, starting at 'From Zero to Modding' and, after step #5, jumping to step #2 in 'Building and Testing Your Mod'.
Any help is greatly appreciated.
Apologies in advance if it's something stupid on my part.