[classic asp] Headache!

[mrbios]

Got an issue with a system that hasn't been made by me, but it is a custom built system running in ASP, on IIS7 and it uses a MS Access database.

 

The error we're getting at the moment which only happens on some entries is this:

Microsoft VBScript runtime error '800a0006'

Overflow

/DAD3v2/save_form.asp, line 157

 

this is what line 157 looks like:

average=round(total/(band_grade(slot)+band_grade(slot-1)+band_grade(slot-2)),0)

 

I don't claim to know anything about this code or how it works, but the same error under IIS6 is supposably fixable with a hoxfix by MS. The information that i've been given is that this is occouring because two sites or components are conflicting and trying to write to the same memory space.

 

Can anyone help me out here? any suggestions welcome, I'm getting a headache.

[Meldrew]

Error 800a0006 appears to be divide by zero according to google, so (band_grade(slot)+band_grade(slot-1)+band_grade(slot-2)) must evaluate to 0 somewhere earlier in the code if this helps.

 

Meldrew.