Incorrect field type in visual queries (Measure vs Column).

A visual fails to load because fields are typed as Measure when they should be Column, or vice versa.

Why it happens

• Category or Series fields typed as Measure (they should be Column).
• A value field typed as Column (it should be Measure).

How to fix it

1. Set Category/Series projections to Column and value projections to Measure.
2. Match each field's type to the role it plays in the visual.