[js][cs4] Can't Place File

Please help! I'm trying to place an image in a frame using data from a table. I've done this successfully in the past, but right now javascript/indesign is behaving very strangely. Heres part of the code:

myAllPageItems[3].place(File(a[5]+a[4]))
where a[5] and a[4] are the image file path and name respectively.

This is the error I get. I have no idea what this file is (or isn't) or where it came from.

The file /Applications/Adobe InDesign CS4/Scripts/XHTML For Digital Editions/tmp00000001 was not found

Thanks.

[js][cs4] Can't Place File

I see this occasionally too. Has anyone figured out why this happens on .place?

''The file C:\Documents and Settings\Default User\My Documents\tmp00000001 was not found''

Thanks.