| Text | Dialog cannot be used as generic document window. Reason: .... | 
| Explanation | This error can occur when a Natural dialog is to be displayed as a generic document window in Natural Studio. Common reasons are: (1) The dialog was not created or has already been closed. (2) The dialog is not of type "MDI plug-in window". (3) The creation of the generic document window failed. | 
| Action | Make sure that the dialog has been created and that it is of type "MDI plug-in window". | 
| Text | Natural runtime system is busy. | 
| Explanation | An attempt was made to execute or run a program or dialog through the Natural Studio Automation interface, while the Natural runtime in that session was already executing. This is not possible. | 
| Action | No action required. |