Why do I get 800A0414 errors?

If you are calling a simple subroutine, or a function that has no return value, you omitted the CALL keyword before the function/sub call, or added parentheses. For example, the following code: 
 

<%      set fso = CreateObject("Scripting.FileSystemObject")      fso.CopyFile("c:\test.txt", "c:\test.bak")      set fso = nothing  %>

 
Produces the following error: 
 

Error Type:  Microsoft VBScript compilation (0x800A0414)  Cannot use parentheses when calling a Sub  /<file>.asp, line <line>, column <column>  fso.CopyFile("c:\test.txt", "c:\test.bak")  -----------------------------------------^

 
The solution, according to MSDN: 

• Remove the parentheses from the subroutine invocation.
• Use the Call statement to invoke the subroutine instead.

So, you would re-write the above code as follows: 
 

<%      set fso = CreateObject("Scripting.FileSystemObject")      fso.CopyFile "c:\test.txt", "c:\test.bak"      set fso = nothing  %>

 
or 
 

<%      set fso = CreateObject("Scripting.FileSystemObject")      CALL fso.CopyFile("c:\test.txt", "c:\test.bak")      set fso = nothing  %>