SAP Message BL236 - Disp. prof.: Field cat. messages: Struct. &1 does not exist (see lng txt)

Application Log: Display logs: The message field catalog (MESS_FCAT) is incorrectly defined in thedisplay profile I_S_DISPLAY_PROFILE Entry &V2& has the DDIC structure name: REF_TABLE: &V1& This structure is either non-existent (or inactive) or not flat(contains nested structures or tables).