Hi,
There could be two reasons for this.
1. Check under ABAP connection in SM59 for ADS service running or not. It must be active. You may test the connection or check with Basis Team as well.
2. You need to install Adobe Life Cycle Designer in your system OR the latest SAP GUI ( This contains by default Adobe Life Cycle Designer)
Let me know if this helps you.
Thanks & Regards,
Anil Kumar Sahni