Why do I get ASP 0130 / ASP 0131 errors?

Active Server Pages error 'ASP 0130'   Invalid File attribute   /<file>.asp, line <line>  File attribute '/<file>.asp' cannot start with forward  slash or back slash.     Active Server Pages error 'ASP 0131'   Disallowed Parent Path   /<file>.asp, line <line>  The Include file '../<file>.asp' cannot contain '..' to  indicate the parent directory.

 
To work around either error, use a virtual include, with relative references from the root - rather than the current directory, e.g.: 
 

<!--#include virtual=/folder/file.asp-->

 
As far as the disallowed parent path goes, there is a security measure in IIS, designed mainly for multiple websites (e.g. at an ISP). The concept is to prevent ASP pages in site A from including ASP pages from site B. This measure is called 'enable parent paths' and is usually disabled (it is disabled by default in IIS 6.0; for information, see KB #332117). 
 
Another workaround is to enable parent paths. You can find this setting in the IIS MMC, right-click the web site in question, select properties, on the Home Directory tab, click configuration, and move to the options tab: 
 
 
However, this is the least preferred method. See KB #226474 and KB #184717 for details.