i install sdk 1.5

right click->project -> properties -> android -> project build target

apply and ok but find folling error

[2009-06-02 18:58:33 - demo] no classfiles specified
[2009-06-02 18:58:33 - demo] Conversion to Dalvik format failed with error 1
[2009-06-02 18:58:33 - demo] no classfiles specified
[2009-06-02 18:58:33 - demo] Conversion to Dalvik format failed with error 1
[2009-06-02 18:58:44 - demo] no classfiles specified
[2009-06-02 18:58:44 - demo] Conversion to Dalvik format failed with error 1
[2009-06-02 18:58:44 - demo] no classfiles specified
[2009-06-02 18:58:44 - demo] Conversion to Dalvik format failed with error 1


please give me way

If you are using eclipse.

Click on the project folder in the "Package explorer" and click F5(refresh).
It should work now.