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SMTP_Singleton_DIAGNOSTIC_LOGGER_NAME exception when the first time to send email

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the stack trace: Item has already been added. Key in dictionary: 'SMTP_Singleton_DIAGNOSTIC_LOGGER_NAME' Key being added: 'SMTP_Singleton_DIAGNOSTIC_LOGGER_NAME' at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) at System.Collections.Hashtable.Add(Object key, Object value) at System.Collections.DictionaryBase.System.Collections.IDictionary.Add(Object key, Object value) at #=qCrZu7zrJlMhDU8EkodYuGT2QgPatOKxRwF18plC4yGnun30NVbTMAj8129gfItKY.#=qG1NSmUelGZpPquLDj0Ci5Q==(String #=qUgeLZAjhcJMTqQVamtQQWg==, Logger #=qAgvtW1KxlmIUqSYW7K9pKg==) at Aspose.Email.Tools.Logging.LoggerManager.CreateLogger(String name, LogLevel severity, Appender[] appenders) at Aspose.Email.Tools.Logging.LoggerManager.CreateLogger(String name, LogLevel severity, Appender appender) at Aspose.Email.Tools.Logging.LoggerManager.CreateLogger(String name, Appender appender) at Aspose.Email.Clients.CredentialsByHostClient.#=qJkLABOqqXhg$2W3zzz6YynljbbxtRojvE2QTHgyrAxI=() at Aspose.Email.Clients.CredentialsByHostClient.ResetLogSettings() at Aspose.Email.Clients.CredentialsByHostClient.#=qwKEDnmXqcely5h_iHGtpOw==() at Aspose.Email.Clients.Smtp.SmtpClient.#=qwKEDnmXqcely5h_iHGtpOw==() at Aspose.Email.Clients.CredentialsByHostClient..ctor(String host, Int32 port, String username, String authInfo, Boolean useOAuth, SecurityOptions securityOptions) at Aspose.Email.Clients.CredentialsByHostClient..ctor(String host, Int32 port, String username, String password) at Aspose.Email.Clients.Smtp.SmtpClient..ctor(String host, Int32 port, String username, String password)

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