Is this trying to build geronimo itself?  If so you need to do a bootstrap 
build first, IIRC

mvn clean install -Pstage-bootstrap

If you are trying to build your own .car file you need to mention the 
car-maven-plugin as an extension IIRC

david jencks

On Nov 20, 2012, at 7:50 AM, Marcos Mendez wrote:

> 
> Does anyone know how to solve the "Unknown packaging: car" error using this 
> plugin with maven3?

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