When I try to create a new Data Type called Timezone I get the following error and then all of my Data Types no longer display until I go in and delete the node record from the umbracoNode table. We have Umbraco 4.5.2 and uComponents 2.0

Server Error in '/' Application.
--------------------------------------------------------------------------------

Value cannot be null.
Parameter name: String
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: String

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. 

Stack Trace:

[ArgumentNullException: Value cannot be null.
Parameter name: String]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +10162489
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +207
   uComponents.Core.DataTypes.Similarity.SimilarityDataEditor..ctor() +110
   uComponents.Core.DataTypes.Similarity.SimilarityDataType..ctor() +41

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) +0
   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) +146
   System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) +298
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +79
   umbraco.cms.businesslogic.datatype.controls.Factory.GetNewObject(Guid DataEditorId) +135
   umbraco.cms.businesslogic.datatype.controls.Factory.GetAll() +429
   umbraco.cms.businesslogic.datatype.DataTypeDefinition.MakeNew(User u, String Text, Guid UniqueId) +405
   umbraco.cms.businesslogic.datatype.DataTypeDefinition.MakeNew(User u, String Text) +128
   umbraco.DataTypeTasks.Save() +98
   umbraco.presentation.create.dialogHandler_temp.Create(String NodeType, Int32 TypeId, Int32 NodeId, String Text) +1074
   umbraco.presentation.create.dialogHandler_temp.Create(String NodeType, Int32 NodeId, String Text) +71
   umbraco.cms.presentation.create.controls.simple.sbmt_Click(Object sender, EventArgs e) +394
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +115
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +140
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +29
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2981

--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.5420; ASP.NET Version:2.0.50727.5420