The Feature is not a Farm Level Feature and is not found in a Site level defined by the Url

When you try to activate the feature using using powershell command : Enable-SPFeature, you may get error like " The Feature is not a Farm Level Feature and is not found in a Site level defined by the Url"

Solution #1: Use feature id instead of feature name

Solution #2: Check the feature folder is read only in 14 hive

Solution #3: Verify the feature.xml file and check the scope of the feature.