Why do I get 'Invalid procedure call or argument'?
This often happens because you used a VBScript "friendly name" constant in place of its integer equivalent. Visual Basic understands these friendly names, such as FileSystemObject's 'forAppending' and 'forWriting' constants.
An easy solution is to add this line to any include files you use in every page (or else add it at the top of every page, if you don't have a common header in your application):
Another possible cause is trying to use a string operation (like Mid(), InStr(), Left() or Right()) on a NULL value. So for example:
If you're having these problems with NULL values coming out of a database, see Article #2150.
Similarly, passing a starting argument of 0 to the Instr() function will cause the same error. To solve this problem, always start at 1 for string parsing in VBScript.
Still one more possibility is that you have unexpected characters in an FSO writeline call. I recently came across this when using MSXML to write out contents of dynamic ASP files into static HTML files. I had this:
When I ran this code, I received the above error. When I added the unicode format designator, as follows, everything worked fine:
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