Astroraf hi!
According to the guide, the "colName" column should contain the target field names in the ElastiCube. For example, if you want to switch to "Category", then you need to have it as a choice either in the "colName" column as a value in the cube or by manual input.
According to the error, Sisense is trying to find this dimension - "Sample ECommerce.[Brand.Adx]". Please make sure the table and column names are correct in this expression. If no, please review the choices and the table name in your Blox configuration.
Best regards, Lily
