Unable to call types from assembly in LinqPad (6, x64)

Hi!

I am new to the tool, but excited to use it actively. However, when I try to load a custom data type (mass spectrometry data) through an assembly, I get a nullreference exception. The assembly only works for x64 platforms, this is a known issue. but it does work in visual studio provided I set my build target to x64.

ThermoRawFile rawfile = new ThermoRawFile();
//nullref error thrown here.
rawfile.SetCurrentController(ThermoRawFile.CONTROLLER_MS, 1);
Console.WriteLine(rawfile.GetNumSpectra());

The same code works perfectly fine in visual studio... I am able to load other classes from other assemblies without issues as well.

Any suggestions? if need be I could privately share the DLL files.