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I have found different articles about this exception but none of them was my case. Here is the source code: class Program { private static Mutex mutex; private static bool mutexIsLocked = false; static void Main(string[] args) { ICrmService crmService = new ArmenianSoftware.Crm.Common.CrmServiceWrapper(GetCrmService("Armsoft", "crmserver")); //Lock mutex for concurrent access to workflow mutex = new Mutex(true, "ArmenianSoftware.Crm.Common.FilterCtiCallLogActivity"); mutexIsLocked = true; //Create object for updating filtered cti call log ArmenianSoftware.Crm.Common.FilterCtiCallLog filterCtiCallLog = new ArmenianSoftware.Crm.Common.FilterCtiCallLog(crmService); //Bind events filterCtiCallLog.CtiCallsRetrieved += new EventHandler<ArmenianSoftware.Crm.Common.CtiCallsRetrievedEventArgs>(filterCtiCallLog_CtiCallsRetrieved); //Execute filter try { filterCtiCallLog.CreateFilteredCtiCallLogSync(); } catch (Exception ex) { throw ex; } finally { if (mutexIsLocked) { mutexIsLocked = false; mutex.ReleaseMutex(); } } } static void filterCtiCallLog_CtiCallsRetrieved(object sender, ArmenianSoftware.Crm.Common.CtiCallsRetrievedEventArgs e) { tryasasas { if (mutexIsLocked) { mutexIsLocked = false; mutex.ReleaseMutex(); } } catch (Exception ex) { throw ex; } } } filterCtiCallLog.CreateFilteredCtiCallLogSync(); function executes requests to server, and raises some events, one of which is CtiCallsRetrieve event. And I need to release the mutex when this event is fired. But on calling the m

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