[antlr-interest] Error: Declared package doesn't match expected package

[Sailesh Kandula]

While building my first ANTLR project SimpleCalc.g i ran into the error:

The declared package "annexextension.SimpleCalc" does not  match expected
package "".

SimpleCalc.g :

header {
    package annexextension.SimpleCalc;
}
{
        import antlr.TokenStreamRecognitionException;
}

class SimpleCalcParser extends Parser ;


expr    : term ( ( PLUS | MINUS )  term )* ;
term    : factor ( ( MULT | DIV ) factor )* ;
factor    : NUMBER ;

class SimpleLexer extends Lexer;

...


If i remove the package declaration it builds(of course).  I read past
threads and FAQ but couldn't find any pointers. I'm using Eclipse 3.5.1 with
org.antlr.ui (version 4.1.0) plugin. Any hints?
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