>Cetin,
>
>When I use the DO command I get the following error message:
>
>Procedure: SETLIBPROCCLASS
>Error No: 1726
>Message: API library is not found
>Line No.: 145
>
>Do you know what this means?
>
>Thanks Cetin

An API library referenced at line 145 of SETLIBPROCCLASS procedure is not found.

As I said if it's not your own program do not use 'do' approach. Run or API_APPRUN.vcx from downloads.
Cetin