It seems that Excel.WriteToFile node fails at calling Office Interop assemblies which are a way to communicate for third party applications with Excel. See this:
https://social.msdn.microsoft.com/Forums/vstudio/en-US/ac50fa41-8d47-4fa9-81a3-914f262676af/0x80029c4a-typeecantloadlibrary?forum=vsto
Try running this:
