If the rule deck doesn't have any commands with OUTPUT as part of the statement (i.e. nothing is saving any graphical data), then this warning is produced. It is telling you that there will be no graphical (i.e. OUTDISK) data, just summary data such as the ERR.lvs file you refer to.

With an LVS, you might have graphical output data if ERC is being run as part of the LVS, or if specific layers are being output specially, or if DRC is combined with the LVS. If not, and you're just looking at the textual result files, getting this message is reasonable.

You can prevent it (I think) by explicitly putting SUMMARY-ONLY=YES in the *DESCRIPTION block. Check the Dracula Reference manual to be sure (I'm just writing this from memory).

Regards,

Andrew.