I am getting a #error when trying to create a crosstab

I am trying to create a crosstab based on my data. I have a company, invoice type and in the body - I am putting in a percent. I am getting #error in the body. I am using a calculation to get the percentage -

Percentage = Total invoices on time/Total invoices

Total invoices = Count([Invoice type];All)

Total invoices on Time = Sum([On Time])

On Time = if([Days]<=[Due Days]) Then 1 else 0

Days = Clearing date - Doc date

Due Days = If([Terms of Payment] = "Z00") Then 10

                    Else [Terms of Payment]

Please help!