gen already exists but is not a source folder

I am developing my Android project, After I removed a unused library, I got the error:

myproject/gen already exists but is not a source folder. Convert to a source folder or rename it

In my Activity code, all resources from R.java can not be resolved.

I tried, right click on my project => Java Build Path => under "Source" tab, I added gen/ as source. But it does not help with the problem...

Why, how to get rid of this problem?

----UPDATE----

I found that, the eclipse also complain that "Project has no project.properties file! Edit the project properties to set one." , but I do have project.properties file under my project. Why it complains? I have cleaned the project and "fix project properties" but it does not help.

Solution 1:

I get the same problem.

Two actions, first:

1.Right click on the project and go to "Properties"

2.Select "Java Build Path" on the left

3.Open "Source" tab

4.Click "Add Folder..." and check "gen" and "src"

second: (because the previous action asked me to remove something... I do not remember what it was...)

1. Right click on the project and go to "Properties"

2. Select "Java Build Path" on the left

3. Open Libraries "tab"

4. Add an external JAR. Add the Google API that is in your android directory (android-sdk\platforms\android-yourversion

And now it works for me!

Solution 2:

Solution :

Step 1 :

• Right click on the project and go to "Properties"
• Select "Java Build Path"
• Switch to "Source" tab Remove all sources from source folder on Build Path
• Restart Eclipse

Step 2 :

• Right click on the project and go to "Properties"
• Select "Java Build Path"
• Switch to "Source" tab
• Click "Add Folder..." and check "gen" and "src" source folder on Build Path
• Restart Eclipse

Final

Build Project(s)

Happy Coder :)

Solution 3:

1. Right click on the project and go to Properties
2. Select Java Build Path on the left
3. Open Source tab
4. Click Add Folder... and check gen and src

Solution 4:

This is caused by using the wrong importer in Eclipse. If you have Android projects, you need to import them into your workspace with Android->Existing Android Code, not General->Existing Projects.

Solution 5:

i had to delete the entire gen folder within eclipse not from file explorer. then did a clean and it was rebuilt. funny this occured right after i ran a Lint HTML report.