Field above a hidden Top/Bottom filtering context field can not be a custom group field. You are trying to add custom group ...

Field above a hidden Top/Bottom filtering context field can not be a custom group field. You are trying to add custom group field '|0' to axis, which is right above field '|2', the context of the filtered field '|1'. Drag field '|2' back on the Axis or turn off filtering and try again.