Error when deploying a custom content type from VS 2010

Today, I was updating my custom content type for my project and when I tried to deploy the solution from Visual Studio, the deployment failed with this error:

Error 26 Error occurred in deployment step ‘Activate Features’: The field with Id {b37fb1f7-c9f0-443a-8b06-7f58390d49d2} defined in feature {a9d2fbfb-78d3-492f-94f2-95026753a0c4} was found in the current site collection or in a subsite.

I tried several time deploying and retracting the solution and the result was always the same error.

There are some workarounds to fix this:

Workaround 1:

Open Task Manager and killed VSSPHost4 process.

Workaround 2:

Right click on Project node in Solution explorer and click “Retract”. This will retract the Field.
Close VS. This will flush the stale cache.
Open the project in a new instance of VS and re-deploy the solution.

Workaround 3:

If closing VS after retract doesn’t solve the problem then a longer workaround is:

Redeploy the project -> This will show an error during feature activation.
Go to “Manage Site Features” under “Site Settings” in SharePoint UI in the browser.
Activate and then Deactivate the deployed feature which contains the Field.
Retract the Solution in VS i.e. right click on the Project node and click “Retract”.
Close VS. This will flush the stale cache.
Open the project in a new instance of VS and re-deploy the solution. This should work.