ID:206005 Cannot add multiple HEX files to <Main Block Data or Bottom Boot Data> item

CAUSE: You clicked Open Conversion Setup Data to open a Conversion Setup File (.cof). However, the Conversion Setup File you selected contains Main Block Data or Bottom Boot Data items containing multiple HEX files, which is no longer supported by the Quartus Prime software.

ACTION: Click OK to close the message dialog box and then create a new Conversion Setup File.