Error reading Excel file

Hi!

First of all thanks for your work, we love LunchBox.

We are working on a project and we need to create a graph for a presentation, reading data from an Excel sheet. We have used LunchBox before, with these files (2 weeks ago), and it didn't fail. We haven't changed the format or content of the Excel sheet.

When we try to read data from it we are getting this error:

0. System.Runtime.InteropServices.COMException (0x800401E3): Operation unavailable (Exception from HRESULT: 0x800401E3 (MK_E_UNAVAILABLE))
   at System.Runtime.InteropServices.Marshal.GetActiveObject(Guid& rclsid, IntPtr reserved, Object& ppunk)
   at System.Runtime.InteropServices.Marshal.GetActiveObject(String progID)
   at LunchBox.WF_ExcelRead.SolveInstance(IGH_DataAccess DA)

I attach the project files and the Excel sheet in case you find them useful.

Thanks again!

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