I just saw your comment under the lunchbox, I want to ask if you have any idea about how to solve the problem? I encountered with the same issue in my situation, since I'm not expertise in C++, could you give me some advise?
The read/write excel components aren't working for me. They were working even yesterday, but today I get this error:
System.Runtime.InteropServices.COMException (0x800A03EC): Exception from HRESULT: 0x800A03EC at Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet(Object o, Type objType, String name, Object args, String paramnames, Boolean CopyBack) at LunchBox.WF_ExcelRead.SolveInstance(IGH_DataAccess DA)