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I didn't find any reason why we couldn't add this, so it will be in v3.2.

I believe an invoice should still be created for a zero-cost service, and it will simply be marked as paid when the cron runs, and then the service will be activated. I'm not sure what's going on with your server group, but the error seems to indicate that it was not able to choose a server (module row) to provision the service on. Based on the OP's similar issue, it may be a simple configuration problem that a reinstall of cPanel resolves as Licensecart pointed out. Unless you can provide steps to duplicate this problem consistently (i.e. what module rows you have, how you have your packages setup, etc.), we wouldn't have enough to go on to determine whether it's actually a bug with the module.

CORE-1123, thanks for the report!