During the move from LibslDecode to DotNetDecode the exported functions in the .h file left at the Libsl prefix, thereby alowing the C++ compiler to marshal the DotNet* functions and making it impossible to reference them from C# Furthermore the dotnet.cpp still contained LibslDecode, while the C# code already referred to it as DotNetDeocde. Patch to fix included, after recompilation the issue went away.