Kavita,
layout sets (="forms") in SAPscript are client-specific AND language-specific.
If a requested form is not found in current client, the form is searched also in client 000 as second guess (to allow SAP standard forms to be found).
Only if it is also not found there (which is normal for Z... named forms which are customer objects) you would get the error.
Where does the error occur(what is the technical error ID and number)?
Regards,
Alex