Minecraft is crashing...You should post a message here, copy crash report and post it on the forum. You should also add mods used, candycraft version and as much details as possible.
How do I make the portal ?Create sugar blocks (wiki page) and make a nether portal shape. Open the portal by right-clicking(without sneak) on the bottom blocks with a lava bucket or caramel bucket.
There's no mobs inside candylands...Check world gamerules, candycraft configuration file or server configuration.