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My friend can't trade villagers and does not have toomanyitems mod installed. Sometimes the trading villager won't even notice her and will walk away. I run a minecraft server multiplayer with this mod installed 1.7.2 and forge 1.7.2 on both my multiplayer and singleplayer. I also installed 1.7.2 forge and millenaire on her computer as well.
The trading works completely fine for me. Some items on her trading box doesn't show up on mine for example it shows she can sell a block but on mine it doesn't give me that option however she's crashing whenever she trades with the villager Please help! I've been trying to look for solutions for weeks.
(She has more buy option items than I do) Instantly when she trades the town trader she crashes. P.S. I'm the one hosting the server and I have no problems with crashing and I have redownloaded forge 1.7.2 and the mod several times.

I can't take a picture of what she sees because her minecraft crashes too fast but here's what mine looks like (without any errors)


Here is the crash error message that she gets:

java.lang.NullPointerException: Rendering screen
at org.millenaire.common.Building.getSellingPrice(Building.java:8305)
at org.millenaire.common.item.Goods.getCalculatedSellingPrice(Goods.java:1379)
at org.millenaire.common.ContainerTrade$TradeSlot.isProblem(ContainerTrade.java:175)
at org.millenaire.client.gui.GuiTrade.func_73863_a(GuiTrade.java:269)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1061)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:944)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:835)
at net.minecraft.client.main.Main.main(SourceFile:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

Nevermind Fixed it. I made a backup server one day and was actually using the backup, for some reason it errored with her and it refused to work. Used the original one and now it's working.