Getting .NET IndexOutOfRangeException on compiled function.

Hi there, we have a simple function to load a model:

function model = LoadModel(inModelPath)
    modelStruct = load (inModelPath);
    model = modelStruct.SVMModel;
end

We compiled it for .NET and we use it as follows:

using (LoadModel prediction = new LoadModel())
{
    MWArray path = new MWCharArray(MODELPATH);

    var argsOut = prediction.LoadModel(1, path);

    using (MWArray model = argsOut[0])
    {
        Assert.NotNull(model);
    }
}

The problem is that sometimes we get the following exception:

System.IndexOutOfRangeException: 'Exception of type 'System.ArgumentOutOfRangeException' was thrown. Parameter name: numArgsOut'

And sometimes we compile it again and works as expected.

Anyone can give some light here? Will be very much appreciated.

Thanks in advance.

EDIT

After further investigation we have realize that the working Dlls are 35MB and the non working are 13KB