In cells A1 to C3, I'm typing in:

1 4 7
2 5 8
3 6 9

I then select cells A5 to C7 and type
=MINVERSE(A1:C3) , then CTRL-SHIFT-ENTER

and I get
#NUM! #NUM! #NUM!
#NUM! #NUM! #NUM!
#NUM! #NUM! #NUM!

in cells A5 to C7
What am I doing wrong ? Any ideas ?
Thanks in advance.