plugin detects the votes but gives no rewards when /claim

(02:32:22) | Web request callback raised an exception (FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.)

at System.Text.StringBuilder.AppendFormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x000ff] in <fb001e01371b4adca20013e0ac763896>:0

at System.String.FormatHelper (System.IFormatProvider provider, System.String format, System.ParamsArray args) [0x00023] in <fb001e01371b4adca20013e0ac763896>:0

at System.String.Format (System.String format, System.Object[] args) [0x00020] in <fb001e01371b4adca20013e0ac763896>:0

at Oxide.Plugins.EasyVote._lang (System.String key, System.String id, System.Object[] args) [0x0000e] in <b27912ac930946ff95b297f21028ebe5>:0

at Oxide.Plugins.EasyVote.GaveRewards (BasePlayer player, System.Collections.Generic.List`1[T] rewardValue) [0x0009a] in <b27912ac930946ff95b297f21028ebe5>:0

at Oxide.Plugins.EasyVote.RewardHandler (BasePlayer player, System.String serverName) [0x00259] in <b27912ac930946ff95b297f21028ebe5>:0

at Oxide.Plugins.EasyVote.ClaimReward (System.Int32 code, System.String response, BasePlayer player, System.String url, System.String serverName) [0x0012e] in <b27912ac930946ff95b297f21028ebe5>:0

at Oxide.Plugins.EasyVote+<cmdClaim>c__AnonStorey3.<>m__0 (System.Int32 code, System.String response) [0x0002e] in <b27912ac930946ff95b297f21028ebe5>:0

at Oxide.Core.Libraries.WebRequests+WebRequest.<OnComplete>b__42_0 () [0x00034] in <d5f57e12edfe4fa0b5c5dbdd9b51eff8>:0