Bukkit

What steps will reproduce the problem?
1.  Running MineCart Mania with Deposit Item signs

What is the expected output? What do you see instead?
Game appears to run normally, but the number of exceptions increases.

What version of the product are you using?
1.6.4 R2.0 of Bukkit, Minecart Mania 2.3.2

Do you have an error log of what happened?

Yes!
2013-12-05 01:42:43 [SEVERE] Exception in thread "Thread-44447"
2013-12-05 01:42:43 [SEVERE] java.lang.NullPointerException
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.chests.ItemDepositContainer.doCollection(ItemDepositContainer.java:30)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.actions.DepositItemsAction.execute(DepositItemsAction.java:22)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeDebug(SignAction.java:36)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeAsSign(SignAction.java:32)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.MMSign$1.run(MMSign.java:115)
2013-12-05 01:42:43 [SEVERE] at java.lang.Thread.run(Unknown Source)
2013-12-05 01:42:43 [SEVERE] Exception in thread "Thread-44448"
2013-12-05 01:42:43 [SEVERE] java.lang.NullPointerException
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.chests.ItemDepositContainer.doCollection(ItemDepositContainer.java:30)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.actions.DepositItemsAction.execute(DepositItemsAction.java:22)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeDebug(SignAction.java:36)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeAsSign(SignAction.java:32)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.MMSign$1.run(MMSign.java:115)
2013-12-05 01:42:43 [SEVERE] at java.lang.Thread.run(Unknown Source)
2013-12-05 01:42:43 [SEVERE] Exception in thread "Thread-44446"
2013-12-05 01:42:43 [SEVERE] java.lang.NullPointerException
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.chests.ItemDepositContainer.doCollection(ItemDepositContainer.java:30)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.actions.DepositItemsAction.execute(DepositItemsAction.java:22)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeDebug(SignAction.java:36)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeAsSign(SignAction.java:32)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.MMSign$1.run(MMSign.java:115)
2013-12-05 01:42:43 [SEVERE] at java.lang.Thread.run(Unknown Source)
2013-12-05 01:42:43 [SEVERE] Exception in thread "Thread-44444"
2013-12-05 01:42:43 [SEVERE] java.lang.NullPointerException
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.chests.ItemDepositContainer.doCollection(ItemDepositContainer.java:30)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.actions.DepositItemsAction.execute(DepositItemsAction.java:22)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeDebug(SignAction.java:36)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeAsSign(SignAction.java:32)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.MMSign$1.run(MMSign.java:115)
2013-12-05 01:42:43 [SEVERE] at java.lang.Thread.run(Unknown Source)
2013-12-05 01:42:43 [SEVERE] Exception in thread "Thread-44452"
2013-12-05 01:42:43 [SEVERE] java.lang.NullPointerException
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.chests.ItemDepositContainer.doCollection(ItemDepositContainer.java:30)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.actions.DepositItemsAction.execute(DepositItemsAction.java:22)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeDebug(SignAction.java:36)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeAsSign(SignAction.java:32)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.MMSign$1.run(MMSign.java:115)
2013-12-05 01:42:43 [SEVERE] at java.lang.Thread.run(Unknown Source)
2013-12-05 01:42:43 [SEVERE] Exception in thread "Thread-44445"
2013-12-05 01:42:43 [SEVERE] java.lang.NullPointerException
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.chests.ItemDepositContainer.doCollection(ItemDepositContainer.java:30)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.actions.DepositItemsAction.execute(DepositItemsAction.java:22)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeDebug(SignAction.java:36)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.SignAction.executeAsSign(SignAction.java:32)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.MMSign$1.run(MMSign.java:115)
2013-12-05 01:42:43 [SEVERE] at java.lang.Thread.run(Unknown Source)
2013-12-05 01:42:43 [SEVERE] Exception in thread "Thread-44453"
2013-12-05 01:42:43 [SEVERE] java.lang.NullPointerException
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.chests.ItemDepositContainer.doCollection(ItemDepositContainer.java:30)
2013-12-05 01:42:43 [SEVERE] at com.afforess.minecartmania.signs.actions.DepositItemsAction.execute(DepositItemsAction.java:22)
2013-12-05 01:42:43 [SEVERE] at com.afforess

Please provide any additional information below.

I'm trying to reproduce this and not having any luck... could you describe how you have the chest and sign set up and whats on the sign?