This post show you How to solve 'Call was rejected by callee. (Exception from HRESULT: 0x80010001 (RPC_E_CALL_REJECTED))' when using c# with Microsoft Office Interop (e.g. Microsoft.Office.Interop.Word.Document).

.Net solving error: Call was rejected by callee

1. Active your Microsoft Office

2. Turn off all grammar / spelling functions

object newTemplate = false;
object docType = 0;
object isVisible = true;
object missing = Type.Missing;
oDoc = oWord.Documents.Add(ref missing, ref newTemplate, ref docType, ref isVisible);
oDoc.ShowGrammaticalErrors = false;
oDoc.ShowRevisions = false;
oDoc.ShowSpellingErrors = false;