Web Part Error: An error has occurred.
Error Details:
[TargetInvocationException: Exception has been thrown by the target of an invocation.]
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)
at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.Activator.CreateInstance(Type type)
at Microsoft.SharePoint.WebPartPages.SPWebPartSerializer.get_DefaultControl()
at Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.SerializedWebPart..ctor(SPWebPartManager webPartManager, XmlNamespaceManager xmlnsManager, Byte[] sharedData, Byte[] userData, String[] links, Type type, SPWeb spWeb)
at Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.Deserialize(SPWebPartManager webPartManager, XmlNamespaceManager xmlnsManager, Byte[] userData, Byte[] sharedData, String[] links, Type type, SPWeb spWeb)
at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)
[ObjectDisposedException: Cannot write to a closed TextWriter.]
at System.IO.__Error.WriterClosed()
at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
at System.IO.StreamWriter.Write(Char[] buffer, Int32 index, Int32 count)
at System.IO.TextWriter.WriteLine(String value)
at ProActive.Util.Log.LogFileRollOverTraceListener.WriteLine(String value)
at System.Diagnostics.TraceListener.WriteLine(String message, String category)
at System.Diagnostics.TraceInternal.WriteLine(String message, String category)
at System.Diagnostics.Trace.WriteLine(String message, String category)
at ProActive.Util.Log.DefaultTracer.Trace(String message, String level, TraceLevel traceLevel)
at ProActive.Util.Log.DefaultTracer.Verbose(String message)
at Gumlink.Sharepoint.WebParts.InfoBoxWebPart..ctor(String cssClass)
at Gumlink.Sharepoint.WebParts.InfoBoxWebPart..ctor()