Jan 27, 2015 7:50:49 PM com.laytonsmith.core.extensions.ExtensionManager Initialize
SEVERE: Could not load class 'com.laytonsmith.core.functions.Math.expr'
java.lang.NoClassDefFoundError: com/sk89q/worldedit/internal/expression/ExpressionException
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:274)
        at com.laytonsmith.PureUtilities.Common.ClassUtils.forCanonicalName(ClassUtils.java:132)
        at com.laytonsmith.PureUtilities.Common.ClassUtils.forCanonicalName(ClassUtils.java:47)
        at com.laytonsmith.PureUtilities.ClassLoading.ClassMirror.ClassReferenceMirror.loadClass(ClassReferenceMirror.java:62)
        at com.laytonsmith.PureUtilities.ClassLoading.ClassMirror.ClassMirror.loadClass(ClassMirror.java:434)
        at com.laytonsmith.core.extensions.ExtensionManager.Initialize(ExtensionManager.java:460)
        at com.laytonsmith.core.Main.main(Main.java:227)
Caused by: java.lang.ClassNotFoundException: com.sk89q.worldedit.internal.expression.ExpressionException
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 8 more