I just had the same error. So I digged a little into the code and I found 
that the default english plural rule only support "other" and "one".
To solve the problem, I redefined DefaultRule_en.java 
<http://code.google.com/p/google-web-toolkit/source/browse/releases/2.1/user/src/com/google/gwt/i18n/client/impl/plurals/DefaultRule_en.java>
 to 
use 
DefaultRule_0_1_2_n.java<http://code.google.com/p/google-web-toolkit/source/browse/releases/2.1/user/src/com/google/gwt/i18n/client/impl/plurals/DefaultRule_0_1_2_n.java>
 instead 
of 
DefaultRule_1_0n.java<http://code.google.com/p/google-web-toolkit/source/browse/releases/2.1/user/src/com/google/gwt/i18n/client/impl/plurals/DefaultRule_1_0n.java>
.

public class DefaultRule_en extends DefaultRule {
  @Override
  public PluralForm[] pluralForms() {
    return DefaultRule_0_1_2_n.pluralForms();
  }

  @Override
  public int select(int n) {
    return DefaultRule_0_1_2_n.select(n);
  }
}

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