Browse - Programming Tips - How do I fix this error: project/gen already exists but is not a source folder. Convert to a source folder or rename it

Date: 2013nov1
OS: Android
Product: Eclipse

Q.  How do I fix this error: <project>/gen already exists but is not a source folder. Convert to a source folder or rename it
   
A.  Right-click on the project go to

Properties > Java Build Path > Sources
If you have one source for the entire project remove it. Add "gen" and "src"