camel-flatpack dataformat example in fuse

Issue

• We have the following in out pom.xml file,

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-flatpack</artifactId>
    <version>2.18.3</version> 
</dependency> 

• We then set up a route in RouteBuilder for testing,

@Override
    public void configure() throws Exception {
FlatpackDataFormat df = new FlatpackDataFormat();
        df.setDefinition("resources/INVENTORY-Delimited.pzmap.xml");
        df.setFixed(false);
        df.setDelimiter(',');
        df.setIgnoreFirstRecord(true);
        from("file:data/inbound?noop=true").unmarshal(df).log("unmarshal fine");
    }

• We are getting compile error saying: The type org.apache.camel.spi.DataFormatName cannot be resolved. It is indirectly referenced from required .class files.
  Based on the online doc here, http://camel.apache.org/flatpack-dataformat.html, we do not find anything missing in the pom.xml. Could you tell what the error means and how to resolve it? We are using camel 2.15.1.redhat-620133.