Thanks for the help!
I did a complete new install on my Windows desktop and now it is working. I did also a new install on my MAC and that was not working, then I found this post:
http://forums.runrev.com/viewtopic.php? ... yo+#p41600 and did these steps:
1) Open up the folder where you have installed the android SDK
2) In there should be a sub folder named platforms and a sub folder named
platform-tools. Within the platforms folder should be a folder named android-8.
Create a new folder in the android-8 folder and name it "tools".
3) Copy the contents of the platform-tools folder (located at the base of the sdk,
next to the platforms folder) into the newly created tools folder.
Then I got this error message:
There was an error while saving the standalone application could not encode the class bundle.
I found this to solve this error: "I went to the Android3->Tools folder. Copied the DX file out of there and placed it in the Android8->tools folder".
and now it is working on my MAC also.
Thanks!