Application component hierarchy for Logsys "T90CLNT090" does not exist

Please help!

I am using an ECC6 IDES system, recently installed. When I select RSA1 -> BW workbench

I get the message:

There is no application component hierarchy in BW for soruce system &1. Do you want to replicate the application component hierarchy now?

if I select Yes I get the error message "Application component hierarchy for Logsys "T90CLNT090" does not exist.

How do I solve this problem

thanks.