Go to Project » Properties » Java Build Path » Libraries and remove all except the “Android X.Y” (in my case Android 1.5). click OK. Go to Project » Clean » Clean projects selected below » select your project and click OK. That should work.
It is also possible that you have a JAR file located somewhere in your project folders (I had copied the Admob JAR file into my src folder) and THEN added it as a Java Path Library. It does not show up under the Package Explorer, so you don’t notice it, but it does get counted twice, causing the dreaded Dalvik error 1.
Another possible reason could be package name conflicts. Suppose you have a package
com.abc.xyz and a class named
A.java inside this package, and another library project (which is added to the dependency of this project) which contains the same
com.abc.xyz.A.java, then you will be getting the exact same error. This means, you have multiple references to the same file
A.java and can’t properly build it.
In other ways this may be occurred if you accidentally or knowingly edit/ add any thing in the class path file manually .In certain cases we may add android.jar path manually to classpath file for generating java doc.On removing the that after javadoc generated code will works fine.Please check this too if any one still occurs.