Unknown property: checks.type

I'm getting 

[INFO] --- gwt-maven-plugin:2.8.0-SNAPSHOT:compile (default) @ demo ---

[INFO] [ERROR] Unexpected internal compiler error

[INFO] java.lang.IllegalArgumentException: Unknown property: checks.type

[INFO] at com.google.gwt.dev.cfg.Properties.setProperties(Properties.java:132)

What am I doing wrong ? 

Thanks

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