Problem with run my first android program
<p>i'm new for android. i try to write HelloAnroid but when i run program. there are two errors. 
    1. Unable to open class file C:\Documents and Settings\Administrator\workspace\HelloAndroid\gen\com\example\helloandroid\R.java: No such file or directory
    2. Error generating final archive: Debug Certificate expired on 22/11/2497, 2:29 น.  </p>

<p>i don't know what it happen. please help me for these errors.</p>
