can't run my first start render

[brendan_cheung]

Dear All ,
Im a beginner, can anyone help me

V-Ray for sketchup first render have some error, its shows

Failed to start render : Error while preparing. Probably unable to obtain license. Check log for more details.
/Applications/ChaosGroup/V-Ray/V-Ray for SketchUp/extension/ruby/internal/render_session_production:18:in `start_render'

Error information has been exported to:
/Users/brendancheung-macpro/.ChaosGroup/V-Ray for SketchUp/VRayForSketchUp.log