Data is correct in Webi but when calling it from Dashboard the data shows up as #ERROR

Hello,

I have created a web service in Webi and tested it and the data shows up correctly. But when I call the web service from my dashboard the number fields  shows up as #ERROR.

To give a little more info about my webi report:

the first column is a plain text field (this column does show up in my dashboard). the rest of my fields are functions that return a number value

Ex. =[Meter] Where([Date] = [Yesterday (5)]) The data is number that is based on a particular date where yesterday(5) =ToDate(Concatenation(RelativeDate(CurrentDate();-5);" 00:00:00");"dd.MM.yyyy hh:mm:ss")

any suggestions as to why my data shows correctly in webi and error in Dashboard?

Attached is the screen shot of the case I mentioned.

Thanks in advance!