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Virtuoso Chip Assembly Router in 6.1.8

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Hello,

I am having issues with starting up VCAR in 6.1.8 as mentioned. I was wondering whether this feature has been changed in this IC release. When I was using 6.1.6 the VCAR GUI window used to startup when launching it through layout XL like its shown below. 

Now when I try to launch it through Layout XL, I am getting the following error in the CIW when I press ok in VCAR Startup setup window.

 # Exiting because of license failure

Does this mean that during the upgrade to 6.1.8 from 6.1.6, a necessary license file was missed? Does the feature require separate licensing?

I am also able to do some Automatic routing of my nets from the Route pulldown menu in the Layout L toolbar. How is this feature different from VCAR?Is the only difference here that VCAR requires a rules file? 


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