System.ObjectDisposedException

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My web app crashed and the following Event Log entry was created (Windows 2003 Server)
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An unhandled exception occurred and the process was terminated.

Application ID: /LM/W3SVC/1/Root/XXXXX

Process ID: 9999

Exception: System.ObjectDisposedException

Message: Cannot access a disposed object.

StackTrace:
at System.Threading.TimerBase.ChangeTimer(UInt32 dueTime, UInt32 period)
at System.Threading.Timer.Change(Int32 dueTime, Int32 period)
at ALT.SMS.SmppClient.7vYStJh1l()
at ALT.SMS.SmppClient.Disconnect()
at ALT.SMS.SmppClient.n1dyuoXjD(IAsyncResult )
at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
at System.Net.ContextAwareResult.CompleteCallback(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Net.ContextAwareResult.Complete(IntPtr userToken)
at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
at System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

[alt]

Please try last version 2.6.1.