Two sets in the file have the same name but different sizes

It is possible, although undesirable, for a HAR file to contain information about 2 different sets which have the same name, but different sizes. ViewHAR may warn you if this is detected, and it may attempt to prevent you from creating such a situation.

You COULD have two sets called COM, of sizes 3 and 7, in the set library if at least one of those sets was defined in another HAR file (that you opened previously) -- see How the Set Library is built. But you are NOT ALLOWED to attach both COM sets to the same 3x7 real array. Other GEMPACK programs would refuse to read such an array.