text/microsoft-resx 2.0 System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 A non-null SendOrPostCallback must be supplied. Operation has been cancelled. This BackgroundWorker states that it doesn't report progress. Modify WorkerReportsProgress to state that it does report progress. An exception occurred during the operation, making the result invalid. Check InnerException for exception details. This BackgroundWorker is currently busy and cannot run multiple tasks concurrently. This operation has already had OperationCompleted called on it and further calls are illegal. This BackgroundWorker states that it doesn't support cancellation. Modify WorkerSupportsCancellation to state that it does support cancellation.