System.ArgumentOutOfRangeException: Non-negative number required.

[VinS101]

This error happened after I installed Strongnamer on an ASP.NET MVC web application:

Severity Code Description Project File Line Suppression State
Error The "StrongNamer.AddStrongName" task failed unexpectedly.
System.ArgumentOutOfRangeException: Non-negative number required.
Parameter name: count
at System.IO.BinaryReader.ReadBytes(Int32 count)
at Mono.Cecil.PE.ImageReader.ReadDebugHeader()
at Mono.Cecil.PE.ImageReader.ReadImage()
at Mono.Cecil.PE.ImageReader.ReadImage(Disposable`1 stream, String file_name)
at Mono.Cecil.ModuleDefinition.ReadModule(String fileName, ReaderParameters parameters)
at StrongNamer.AddStrongName.ProcessAssembly(ITaskItem assemblyItem, StrongNameKeyPair key, StrongNamerAssemblyResolver resolver)
at StrongNamer.AddStrongName.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext() XgApp

Keep in mind that my web app is signed using my own private key.