how can I fix this error, The message filter indicated that the application is busy - vsto

Question

I keep getting this error in word, excel powerpoint how can i fix it
Error=The message filter indicated that the application is busy.
(Execption from HRESULT: 0x8001010A(RPC_E_SERVERCALL_RETRYLATER))
foreach (Presentation document in Globals.ThisAddIn.Application.Presentations.Cast<Presentation>().ToList())
{
while (document.ReadOnly!= Microsoft.Office.Core.MsoTriState.msoTrue)
{
break;
}
var item = FODocumentRepository.GetByLocalPath(document.FullName);
if (item == null)
{
if (DocHelper.IfFileOrbisDocument(document.FullName))
{
FODocumentRepository.Add(document.FullName, document.FullName);
}
}
}
var repositoryList = FODocumentRepository.GetAll().ToList();
// var abc = Globals.ThisAddIn.Application.Workbooks.Cast<Workbook>().Select(x => x.FullName).ToList();
List<FODocument> deleteList = new List<FODocument>();
foreach (var item in repositoryList)
{
bool founded = false;
foreach (Presentation document in Globals.ThisAddIn.Application.Presentations)
{
if (item.LocalPath == document.FullName)
{
founded = true;
break;
}
}
if (!founded)
{
MessageBox.Show("DocumentClosed");
FileorbisConflictManager.DocumentClosed(ServiceSettings.GetToken(), DocHelper.GetDocumentKey(item.FOPath),DocumentType.PowerPoint);
deleteList.Add(item);
}
}
foreach (var item in deleteList)
{
FODocumentRepository.Remove(item.LocalPath);
}

Answer 1

These kind of errors occur due to threading contention issues between external multi-threaded applications and Visual Studio. They can be eliminated by implementing IOleMessageFilter error handlers in your Visual Studio automation application. Read more about that in the How to: Fix 'Application is Busy' and 'Call was Rejected By Callee' Errors article.
Also you can find the same issue described on the Exception thread.