Eclipse webdriver error: ClassNotFoundException

I'm getting this error "ClassNotFoundException" when I try to execute this line of code:

driver = new FirefoxDriver();

Now, here is the thing. This code was running perfectly fine from the default Eclipse workspace (username/workspace). What I am trying to do is now move my *.java files to a new workspace. And now I'm having this problem.

I've put all of my jar files into one folder and have added them to my package. I have selenium-java-xxx.jar andselenium-server-standalone-xxx.jar files in this new jar folder.

I can switch back to my old workspace and the file runs perfectly fine (firefox loads up fine and executes my selenium java code).

But when I switch to my new workspace, I get the error on that line of code.

I'm not sure where to look to try and fix this error?

Thanks for any help.

hi 

im also new to the webdriver:

try this command:  WebDriver driver = new FirefoxDriver();

instead of driver = new FirefoxDriver();