Format Function Problem

[Buj123]

Hello,
I have a form with a chart in it. I have used the Format function in the Rowsource query of the chart. I have created that 2 months ago and it was working fine. Now all of a sudden its giving me an error saying the "Undefined function 'Format' in query expression"

Format([EndDate],"DDDD&quot
That was the format function.

How to fix it.

 

[Buj123]

I fixed it.
In Module -> New -> Tools -> References

There is some thing like Microst windows common controls checked, and i do need to uncheck it. Now its working fine.