Exclamation Eclipse app can't be launched on hardware device

Hi there,

I got the following problem:

When trying to launch an app from the eclipse IDE, my Galaxy Note 3 is regocnized but the "OK" button stays deactivated when choosing it. The target is "unknown" and the state is "??" - Sometimes "offline".

USB-debugging is activated on the device. I also installed the Samsung OEM driver.

What can I do to fix that problem? Thanks in advance