Ok I have 6 weeks in a calendar I did, and in each days there is a price total for the $ we made this day... and I want to know for each week so I did 6 textbox and they are like this = Day1+Day2+Day3+Day4+Day5

I have 5 weeks working... only one is showing #Number !... and I don't know why... the particularity of this week is that we had no job for a day in the week so the $ for this Day is 0... I know it can cause problems with * but not with + any idea ?