What’s this error?

This is an example found here:

http://www.w3schools.com

set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open(Server.Mappath("northwind.mdb"))
set rs = Server.CreateObject("ADODB.recordset")
rs.Open "Select * from Customers", conn

The following information was found here:

http://www.4guysfromrolla.com/webtech/121799-1.shtml

For example, if you had an ASP script running in the /Inc directory, which had the physical path C:\InetPub\wwwroot\Inc, the following two lines:

Response.Write Server.MapPath("somefile.txt") & "<BR>"
Response.Write Server.MapPath("/somefile.txt") 

Would produce different output. The first line would use the current directory's physical path as the path for somefile.txt, and would output C:\InetPub\wwwroot\Inc\somefile.txt. The second line of code, due to the beginning forward slash, would use the root physical path, producing C:\InetPub\wwwroot\somefile.txt as the output.

Have you moved your database from it's default location (like you're supposed to for security)?

If so, you should have updated both:
common.asp in the root of the forum, and the common.asp file in the admin folder.

Make sure that line 95 of /admin/common.asp either looks similar to line 165 of /common.asp or atleast refers to the same location.

It should look something like this:

strDbPathAndName = Server.MapPath("database/wwForum.mdb")

What I think you have is:
strDbPathAndName = Server.MapPath()

hth