I have a Lenovo IdeaPad, and am trying to connect it to Eclipse. It was working a few weeks ago, but I haven’t tried to run an application on it in a while and now will not show up in Eclipse.
It shows up in my LeTools…

But when I Run my application in Eclipse…

This error also comes up, but I think its a different problem…

Anyway, I think that I’m missing a minor step to get the Device to show up in Eclipse. If anyone knows what this step is, please let me know.
Solved.
Well, it turns out that in that second screen shot, with the EMPTY list of running Android Devices, mine was actually there.
For some reason all the fields ( Serial Number, AVD Name, Target, etc. ), have been changed to an empty string.
Anyway, if I double-click on the first row of the blank list, it loads the app on my device.