SharePoint WebPart

I am having problem in connecting Metastorm Service webpart to other Metastorm webparts. Whenever I try to connect Service Webpart (which is successfully logged in) to Blank Form webpart or any other metastorm webpart, following exception is thrown:

Object reference not set to an instance of an object.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   Metastorm.Web.WebControls.WebParts.ConnectablePart.InitializeProvider(IConnectable provider) +153

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) +0
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) +1255
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +38
   System.Web.UI.WebControls.WebParts.ConsumerConnectionPoint.SetObject(Control control, Object data) +98
   Microsoft.SharePoint.WebPartPages.SPWebPartConnection.Activate() +1980
   Microsoft.SharePoint.WebPartPages.SPWebPartManager.ActivateConnections() +439
   System.Web.UI.WebControls.WebParts.WebPartManager.OnPageLoadComplete(Object sender, EventArgs e) +70
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   System.Web.UI.Page.OnLoadComplete(EventArgs e) +11057518
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3160

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