Is an error you might see when preverifying your midlet. Basically the problem is that the verifier can not find the referenced classes - and if it complains about java.lang.Object it basically can not find anything.
We had this today, and the reason was that our tool (IntelliJ) generated a not so good ant file, with the classpath for the jre. That is not what the preverifier expects. Rather it should be something like: