In the menu of Type of Diagrams there are several different options to choose from. However, Balthzar can not "know" which type of data the selected Diagram is using, therefore the type of Staple is used as standard. If another type is selected this can generate the error message seen below. This message will explain to the user that the selected data type is not compatible with the selected Diagram type.
This is caused because the SQL query used here is incorrect, it does not contain enough data for the diagram. Therefore the user is forced to select another type of diagram. To avoid this problem, select one of the following types that Balthzar supports:
All variants of staple
diagrams.
All variants of line diagrams.
All variants of field diagrams.
All variants of staple diagrams.