When you have a Sharepoint Solution and when you try to deploy it with using visual studio and you got an error like this “Error occurred in deployment step ‘Add Solution’: A feature with ID 15/cc629889-f2c1-4dba-b8fa-1ae0c752bcf2 has already been installed in this farm. Use the force attribute to explicitly re-install the feature” don’t panic 🙂
You can go to the your solution and find the xml feature inside and insert attribut AlwaysForceInstall=True on each of your xml feature. Then you can deploy again.
<?xml version="1.0" encoding="utf-8" ?> <Feature xmlns="http://schemas.microsoft.com/sharepoint/" AlwaysForceInstall="TRUE"> </Feature>