1. Go to the Application Descriptor at Package Viewer and open it.
2. Change Mircroedition configuration and Microedition profile to 1.1 and 2.1 respectiviely.
3. At the runtime section where you can specify the device and environment, add a new device. Please choose the device that you had set up for CLDC 1.1 and MIDP 2.1 based on the previous post
4. Remove the old device and use the newly added device.
5. Save the Application Descriptor and rebuild the project.