Hey umbracos, I have an error that is bringing one of our sites to it's knees just a few minutes after reboot. I found mention of this error in prvious posts, but my permissions and settings seem to be fine. 

This is on a Win 2003 server, SQL server 2005, .NET 3.5, Umbraco 4.5.2

The error seems to have been introduced sporadically without any changes to the server (from reviewing the logs). 

This is a production site so I appreciate any insight you guys have on this...thanks a lot! 

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 8.5px Helvetica} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 8.5px Helvetica; min-height: 11.0px}

An unhandled exception occurred and the process was terminated.

Application ID: DefaultDomain

Process ID: 5932

Exception: System.Runtime.Serialization.SerializationException

Message: Unable to find assembly 'Lucene.Net, Version=2.9.2.2, Culture=neutral, PublicKeyToken=null'.

StackTrace:    at System.Runtime.Serialization.Formatters.Binary.BinaryAssemblyInfo.GetAssembly()

   at System.Runtime.Serialization.Formatters.Binary.ObjectReader.GetType(BinaryAssemblyInfo assemblyInfo, String name)

   at System.Runtime.Serialization.Formatters.Binary.ObjectMap..ctor(String objectName, String[] memberNames, BinaryTypeEnum[] binaryTypeEnumA, Object[] typeInformationA, Int32[] memberAssemIds, ObjectReader objectReader, Int32 objectId, BinaryAssemblyInfo assemblyInfo, SizedArray assemIdToAssemblyTable)

   at System.Runtime.Serialization.Formatters.Binary.ObjectMap.Create(String name, String[] memberNames, BinaryTypeEnum[] binaryTypeEnumA, Object[] typeInformationA, Int32[] memberAssemIds, ObjectReader objectReader, Int32 objectId, BinaryAssemblyInfo assemblyInfo, SizedArray assemIdToAssemblyTable)

   at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.ReadObjectWithMapTyped(BinaryObjectWithMapTyped record)

   at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.ReadObjectWithMapTyped(BinaryHeaderEnum binaryHeaderEnum)

   at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.Run()

   at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize(HeaderHandler handler, __BinaryParser serParser, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage)

   at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream, HeaderHandler handler, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage)

   at System.Runtime.Remoting.Channels.CrossAppDomainSerializer.DeserializeObject(MemoryStream stm)

   at System.AppDomain.Deserialize(Byte[] blob)

   at System.AppDomain.UnmarshalObject(Byte[] blob)

For more information, see Help and Support Center at