Maps must be added to Cisco CMX from Cisco Prime. You can verify this from your Cisco CMX dashboard under Detect & Locate. Ensure that access points have been placed on the maps prior to importing.
If maps have not been imported to Cisco CMX, navigate to Systems>Settings and click Settings. In the Settings dialog box that appears, click Controllers and Map Setup>Import. You can enter the Cisco Prime credentials and click Import Controllers and Maps.
You can also manually upload a tar file from Cisco Prime to Cisco CMX.