I have some error with my android project and eclipse, when I start the emulation it fails:

I think its a problem with eclipse, because it worked yesterday but today I have this error.
I have no more information, the console has nothing ando so does the LogCat.
I tried to clean the project, but the error continues.
How can I solve this?
Go to Task manager kill adb.exe
and relaunch the eclipse
And than clean project.