The Block Property window for an Error Block is shown below.

Ref | Description |
A | Open the Expression Editor by selecting the Pencil icon. The expression’s expected data type is a String. Write the error message in the Expression’s textbox. You can add tokens to the string to make a more specific message. Please review the Expression Editor described in About the Block Property Window,. |
B | Use the Add a Note field to describe the block’s purpose or functionality for easy reference. |