[WD21] How to fix "Overflow during assignment"?

I have one runtime warning in my app's dynamic audit,
"Overflow during assignment"
in the following code:

//StdColorBG is a global array of 24 4-byte unsigned int //Background colors
//These are constants, must not be translated.
StdColorBG = [White,DarkGray,LightRed,YellowToolhelp,DarkBlue,LightCyan, ...
Transparent,LightGray,DarkYellow,DarkGreen,LightBlue,DarkMagenta, ...
Black,DarkRed,LightYellow,LightGreen,DarkCyan,LightMagenta, ...
PastelRed,PastelYellow,PastelBlue,PastelCyan,PastelGreen,PastelMagenta]

Can somebody please explain, why, and what should I do to get rid of the warning?

Best regards
Ola