Set this parameter to 1 and LINGO will display error messages issued by the solver in a modal dialog box. This dialog box must be cleared before LINGO proceeds with any other operation. In some instances, you may have LINGO embedded in other applications, where it may not be desirable, or possible, to have users clearing the error dialog boxes. By setting ERRDLG to 0, LINGO will route the solver's error messages to the report window, where they will be displayed, and no user intervention will be required to clear the messages. Note that this option allows you to route only those error messages generated by LINGO's solver to the report window. Error messages displayed by LINGO's interactive front-end (error codes 1000 and above) will always be posted in dialog boxes. The default is for solver errors to be displayed in dialog boxes.