Try this:
Look in your <project>/javasource folder for your old module and make sure to delete it if it's there. Based on your error messages I think will be called "recaptcha2"
Edit: Ok, I think this is the issue: the java code in the "recaptcha_2" folder is referencing a package called "recaptcha". If you open this project in Eclipse you'll see that issue when opening any of the java files in that module. The quicker fix is probably to delete this module and the java code and re-download the module.
Did you try cleaning up the project deployment files?