playerranks.reward fails to execute rewarding command

Hi!

I'm trying to reward players with RP from the Server Rewards plugin. The rewards are set in data/PlayerRanksRewards.json like this:

"First": "rp add {id} 10"

When I use /pr reward in chat, everything works fine. However, when I use playerranks.reward through the console, I receive a bunch of similar errors:

Command 'rp add 12345678901234567 10' not found.

I am using this method because Player Ranks doesn't reward players on wipe for some reason, despite "IssueRewardsAtWipe": true being set in both the config and data/PlayerRanksRewards.json.

I would appreciate any help with this.