InvalidOperationException: Sequence contains no matching element

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Hi,

We started having this Bolt Compiler error when we try to build the assets. Has anyone ever ran into this problem?

InvalidOperationException: Sequence contains no matching element
System.Linq.Enumerable.First[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) (at <839a3cb835c04d14aeb58d83bb7bc4bd>:0)
Bolt.Compiler.CodeGenerator.FindState (System.Guid guid) (at <61cd2a900315498b89d22f6449f6fa41>:0)
Bolt.Compiler.StateDecorator+d__2.MoveNext () (at <61cd2a900315498b89d22f6449f6fa41>:0)
System.Linq.Enumerable.Any[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] predicate) (at <839a3cb835c04d14aeb58d83bb7bc4bd>:0)
Bolt.Compiler.CodeGenerator.b__e (Bolt.Compiler.StateDecorator a, Bolt.Compiler.StateDecorator b) (at <61cd2a900315498b89d22f6449f6fa41>:0)
System.Collections.Generic.ArraySortHelper`1[T].InsertionSort (T[] keys, System.Int32 lo, System.Int32 hi, System.Comparison`1[T] comparer) (at :0)
System.Collections.Generic.ArraySortHelper`1[T].IntroSort (T[] keys, System.Int32 lo, System.Int32 hi, System.Int32 depthLimit, System.Comparison`1[T] comparer) (at :0)
System.Collections.Generic.ArraySortHelper`1[T].IntrospectiveSort (T[] keys, System.Int32 left, System.Int32 length, System.Comparison`1[T] comparer) (at :0)
System.Collections.Generic.ArraySortHelper`1[T].Sort (T[] keys, System.Int32 index, System.Int32 length, System.Comparison`1[T] comparer) (at :0)
Rethrow as InvalidOperationException: Failed to compare two elements in the array.
System.Collections.Generic.ArraySortHelper`1[T].Sort (T[] keys, System.Int32 index, System.Int32 length, System.Comparison`1[T] comparer) (at :0)
System.Collections.Generic.List`1[T].Sort (System.Comparison`1[T] comparison) (at :0)
Bolt.Compiler.CodeGenerator.SortStatesByHierarchy () (at <61cd2a900315498b89d22f6449f6fa41>:0)
Bolt.Compiler.CodeGenerator.Run (Bolt.Compiler.Project context, System.String file) (at <61cd2a900315498b89d22f6449f6fa41>:0)
Bolt.Compiler.Project.GenerateCode (System.String file) (at <61cd2a900315498b89d22f6449f6fa41>:0)
BoltCompiler.Run (BoltCompilerOperation op) (at <3a3e65c4e7604d1e977cadf75b0a1e9a>:0)
BoltUserAssemblyCompiler.Run () (at <3a3e65c4e7604d1e977cadf75b0a1e9a>:0)
UnityEngine.Debug:LogException(Exception)
BoltUserAssemblyCompiler:Run()
BoltProjectWindow:Footer()
BoltProjectWindow:OnGUI()
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

We never had this bug before, it ws building allright with our latest changes, and now, suddenly, it compiles wrong.

Thanks

Benoit