Minecraft Keeps Crashing?

A few days ago, I installed Forge and two different mods to my game (http://www.planetminecraft.com/mod/lotsomobs/ and http://www.planetminecraft.com/...e-addtion/)" class='ext_link'>http://www.planetminecraft.com/...-addtion/).
I installed these, I think, 4 days ago, and yesterday it started to crash everytime I went into one of my single player servers. I tried going into my other single player servers, and it doesn't crash. It doesn't crash in multiplayer either.
I decided that maybe the Lots O Mobs and the Furniture mod weren't compatible together, so I deleted the Lots O Mobs mod. I tested it out, and that server will still crash.

Is it something wrong with the server or the mod? Because a lot of people have that mod and I haven't heard about any crashes like this from it.
The server is a new server and I haven't built much in it, so I can delete it if it's something wrong with the server.
If it is the mod, I can delete that too. Or if it's forge I can uninstall that, I just don't want it to keep crashing.

I have Minecraft 1.7.10 with forge on a Mac Mini, if that's a factor in this.

Do you know what I can do to fix this?
Thanks in advance!

Added (1). update: the mod link, i see isn't working so here is it that does work: http://www.planetminecraft.com/mod/11-furniture-mod-v10-simple-addtion/

UPDATE: my friend has the same mod as me and the same minecraft version, but on a PC, and she hasn't crashed yet, so it might not be from forge or the mod. But, still, I would love some help on this!

This happened to me too so I emailed forge and they said that minecraft forge 1.7.2 and they will make a new forge for 1.7.2(best answer please )