SharePoint Error: Cannot import the Ad Rotator Web Part

When adding Ad Rotator Web Part to another Web App and error appear "Cannot import the Ad Rotator Web Part"

That's because the Solutions is not implemented in Central Administration.

Solution: 

1- Go to Central Administration
2- System Settings
3- Manage Farm Solutions
4- Select Solution "sectorpoint.products.adrotator.wsp"
5- Select "Deploy Solutions"
6- Select the Web Application you trying to add the Web Part
7- After Deploying try to add the Web Part again
8- Done

Hope it works.