Find Blank Cells With Number

I have this formula in columns C:D and G:F -

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=IF(ISERROR(MATCH(A1494,Jan07!A:A,0)),"",INDEX(Jan07!A:B,MATCH(A1494,Jan07!A:A,0),2))

Some of the cells end up with nothing in them. Columns E and H are the differenced of C & D and G & F respectfully. The problem is that some of the cells in E and H state #VALUE! because there isn't any data in the other columns (C2 is blank, D2 is 24, E2 is #VALUE!). If I update C2 with 0 then I receive the correct answer in E2 of -24.

I want to have a macro auto fill all blank cells (even though there is the formula in them there isn't data) with a "0". I am using the below code and it is Compile error: Type mismatch at the "True" part of the code.

Sub FindEmptyCellAutoFill()
Dim rFound As Range

With ActiveSheet.Range("C:D", "F:G")
Do
Set rFound = . Find(What:=" ", LookIn:=xlValues)
If rFound Is True Then AutoFillValue "0"
If rFound Is False Then Exit Do
Loop
End With

End Sub