I just downloaded Eclipse Galileo and installed ADT10 and tried to a phonegap app using this guide: http://www.phonegap.com/start But each time i try to build im getting this error: Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!
I know that there are already some questions/answers about it in this forum but they didnt work for me.
This is caused by incomplete/messy upgrade to latest version which results in dx.jar missing from {Android SDK dir}\platform-tools\lib\.
Solution:
Find your latest dx.jar in {Android SDK dir}\platforms\*
and copy it to:
{Android SDK dir}\platform-tools\lib\
Restart eclipse, clean your project and everything should work as expected.
(If platform-tools\lib directory is missing entirely you will have to reinstall "Android SDK platform-tools" using SDK manager. After reinstall dx.jar should be in there so no copying will be needed)
If you can't find dx.jar in any of {Android SDK dir}\platforms\* subdirs you will have to start SDK manager and install Android 1.6 SDK.
For example on my machine latest was in {Android SDK dir}\platforms\android-4\tools\lib\.
(I did not find any newer version as of 2012-01-22 Android SDK R15).
I really hope that this is useful for someone because I've wasted half a day investigating and looking for solution of such a trivial bug... :-(