Missing artifact org.vaadin.addons:tableexport:jar:1.3.0:compile

I am new to vaadin, don’t know properly how to use vaadin add-on in pom.xml ,after referring vaadin sites,I have tried to use tableexport but I am getting error" missing artifact" while doing a maven build, I would appreciate some could help me how to configure vaadin add-on in maven

4.0.0 123 123 0.0.1-SNAPSHOT SampleMVNProject vaadin-addons http://maven.vaadin.com/vaadin-addons 6.7.8 2.3.0 org.vaadin.addons tableexport 1.3.0

Should I need any thing else to add on that?

Thanks
Suresh