Data from One Range to Another - return an error if more than 1 entry per column

I need to bring data from range I3:Q13 to C3:G13 , in corresponded Columns
So I need a Formula at C3.
In D5 should be D4, Z5 so I need Error , I should have only one value in corresponded columns (that mean in I3:Q13, something wrong happened for column 2)

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Neither do I!!

In C3:

=IFERROR(IF(SUMPRODUCT(--($I$2:$Q$2=C$2)*--($I3:$Q3<>""))<=1,INDEX($I3:$Q3,MATCH(1,INDEX(($I$2:$Q$2=C$2)*($I3:$Q3<>""),0),0)),"Error"),"")

I did change the title for you, as you made an effort, but... I doubt if ANYONE would ever want to do the same kind of thing that you are wanting to do...

I often wonder what you really want all these formulae for!!!!!