Fixed groovy error with external functions by adding import.
@@ -24,6 +24,7 @@ import org.linqs.psl.model.Model;
import org.linqs.psl.model.atom.QueryAtom;
import org.linqs.psl.model.formula.Formula;
import org.linqs.psl.model.function.ExternalFunction;
+import org.linqs.psl.model.predicate.ExternalFunctionalPredicate;
import org.linqs.psl.model.predicate.FunctionalPredicate;
import org.linqs.psl.model.predicate.Predicate;
import org.linqs.psl.model.predicate.StandardPredicate;
