COUNTIFS getting a SPILL error

[Guzzlr]

Hello All
I have:

=COUNTIFS($T:$T,$AC3,$X:$X,">=0",$W:$W,{"Mon"})

This is working as long as I do not add another day or the rest of the days for a 5 day week. As soon as I add another day, I get the SPILL error...and I'm not understanding why?
Can someone help me with the SPILL error please...
Thank you

 

[steve the fish]

Use =SUM(COUNTIFS etc

 

[Guzzlr]

Use =SUM(COUNTIFS etc

Yep...working!
Thank you