While trying out the Size Assistant feature I encountered a problem. I´m working with this csv Table:
I tried to resize the Point Size based on the field „Anzahl Objk“ and to do this I went to „Layer Properties“ – „Style“ clicked on the Data defined override Button next to the „Size field“ and selected „Size assistant“ at the bottom. In the following window I changed the settings like this:
I clicked o.k. expecting to see values from 1 to 5 in the size of the yellow dot with the no „5“ next to it in the picture above. values from 6 up would then be in the size of the dot with the „10“ next to it. After clicking o.k I got a red tinged button like this next to the size field
And hoovering over it and in the description window it reports the following error:
If I click on Edit in the button menu I get to the expression builder where it reports the same error.
The points on the map don´t change at all. Is there a way to get this to work easily the way I expect it to with this assistant by doing steps differently or do I have to enter or change an expression code somewhere? Or do I completely misunderstand the dialog above and what it is supposed to do?