inst and rm commands using maven / vault plugin - 500 error

When I run the build using bamboo plan and try to deploy I can see below error in bamboo log : 

<crx version="1.4.9" user="admin" workspace="crx.default">
<request>
<param name="cmd" value="inst"/>
<param name="name" value="project-website"/>
</request>
<response>
<data>
</data>
<status code="500">java.lang.IllegalArgumentException: Several packages with name 'project-website' exist. Please specify group.</status>
</response>
</crx>

Any way to specify group?