problem with exporting apk using eclipse on bbox 2

hi
i was using bbox 1.3.6 and when i try to export using eclipse i get an error
now i update to bbox 2.1 i get the same error when i export my game i get this error

i download the last java and android studio
i cleaned android lint preferences but i get the same problem
i heart about updating the api to 21 how i can do that
and thanks

 

Use Eclipse please.
http://buildbox.com/forum/index.php?threads/are-there-any-bb-code-helpers.482/#post-2893
For BB 1.3.6 and BB 2, API 23.

 

what that mean api 21 and 23 icant understand this

 

Other tutorial

http://buildbox.com/forum/index.php...pse-java-and-android-sdk-video-tutorial.2794/