Bukkit

What steps will reproduce the problem?
1. Place a chest down
2. Place a sign
3. Hit the sign with anything.

What is the expected output? What do you see instead?
Expected: Shop created.
Instead: Throw error in console.

What version of the product are you using?
R: Shop v1.4.8 for CB 1.7.2-R0.3 Feb 16, 2014

Do you have an error log of what happened?
Caused by: java.lang.NoSuchFieldError: getEntityManager
    at com.snowgears.shop.DisplayItem.spawn(DisplayItem.java:41) ~[?:?]
    at com.snowgears.shop.DisplayItem.<init>(DisplayItem.java:24) ~[?:?]
    at com.snowgears.shop.ShopObject.<init>(ShopObject.java:42) ~[?:?]
    at com.snowgears.shop.listeners.MiscListener.onPreShopSignClick(MiscListener.java:282) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_55]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_55]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_55]
    at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_55]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:318) ~[server.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    ... 15 more

Please provide any additional information below.
Bukkit version: CraftBukkit version git-Bukkit-1.7.2-R0.3-b3020jnks (MC: 1.7.2) (Implementing API version 1.7.2-R0.3)
ClearLag version: R: ClearLag v2.6.3 for CB 1.7.2-R0.3 Apr 15, 2014

It's caused by change in ClearLag API?
me.minebuilders.clearlag.Clearlag.getEntityManager -> me.minebuilders.clearlag.managers.EntityManager
public void addUnremovableEntity(Plugin p, entity e) { }
public void addUnremovableEntity(Plugin p, UUID uuid) { }