Error on load the plugin

Loaded plugin Better Statistics v1.0.17 by Billy Joe
MySql handle raised an exception in 'BetterStatistics v1.0.17' plugin (MySqlException: Character set 'utf8mb3' is not supported by .Net Framework.)
  at MySql.Data.MySqlClient.CharSetMap.GetCharacterSet (MySql.Data.Common.DBVersion version, System.String CharSetName) [0x00033] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.MySqlField.SetFieldEncoding () [0x00049] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.MySqlField.set_CharacterSetIndex (System.Int32 value) [0x00007] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.NativeDriver.GetColumnData (MySql.Data.MySqlClient.MySqlField field) [0x000ad] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.NativeDriver.GetColumnsData (MySql.Data.MySqlClient.MySqlField[] columns) [0x00004] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.Driver.GetColumns (System.Int32 count) [0x0001c] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.ResultSet.LoadColumns (System.Int32 numCols) [0x00000] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.ResultSet..ctor (MySql.Data.MySqlClient.Driver d, System.Int32 statementId, System.Int32 numCols) [0x0002a] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.Driver.NextResult (System.Int32 statementId, System.Boolean force) [0x00039] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.MySqlDataReader.NextResult () [0x000d2] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
MySql command callback raised an exception in 'BetterStatistics v1.0.17' plugin (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.BetterStatistics+<CreateTable>c__AnonStorey2.<>m__0 (System.Collections.Generic.List`1[T] list) [0x00000] in <ba3b5e1a0566428b94ae3e592247fe22>:0 
  at Oxide.Core.MySql.Libraries.MySql+MySqlQuery+<>c__DisplayClass24_0.<Handle>b__0 () [0x0005d] in <021a1dba6a754e42a6cc7771fdfee190>:0 
MySql handle raised an exception in 'BetterStatistics v1.0.17' plugin (MySqlException: Character set 'utf8mb3' is not supported by .Net Framework.)
  at MySql.Data.MySqlClient.CharSetMap.GetCharacterSet (MySql.Data.Common.DBVersion version, System.String CharSetName) [0x00033] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.MySqlField.SetFieldEncoding () [0x00049] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.MySqlField.set_CharacterSetIndex (System.Int32 value) [0x00007] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.NativeDriver.GetColumnData (MySql.Data.MySqlClient.MySqlField field) [0x000ad] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.NativeDriver.GetColumnsData (MySql.Data.MySqlClient.MySqlField[] columns) [0x00004] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.Driver.GetColumns (System.Int32 count) [0x0001c] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.ResultSet.LoadColumns (System.Int32 numCols) [0x00000] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.ResultSet..ctor (MySql.Data.MySqlClient.Driver d, System.Int32 statementId, System.Int32 numCols) [0x0002a] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.Driver.NextResult (System.Int32 statementId, System.Boolean force) [0x00039] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at MySql.Data.MySqlClient.MySqlDataReader.NextResult () [0x000d2] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
MySql command callback raised an exception (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.BetterStatistics+<CreateTable>c__AnonStorey2.<>m__0 (System.Collections.Generic.List`1[T] list) [0x00000] in <ba3b5e1a0566428b94ae3e592247fe22>:0 
  at Oxide.Core.MySql.Libraries.MySql+MySqlQuery+<>c__DisplayClass24_0.<Handle>b__0 () [0x0005d] in <021a1dba6a754e42a6cc7771fdfee190>:0 
MySql handle raised an exception (MySqlException: Table 'BetterStatistics.TRIO_MONDAYS_stats_wipe' doesn't exist)
  at MySql.Data.MySqlClient.MySqlCommand.EndExecuteReader (System.IAsyncResult result) [0x00022] in <8d7380b3d3cf4bd8be324c584f371b44>:0 
  at (wrapper remoting-invoke-with-check) MySql.Data.MySqlClient.MySqlCommand.EndExecuteReader(System.IAsyncResult)
  at Oxide.Core.MySql.Libraries.MySql+MySqlQuery.Handle () [0x0010e] in <021a1dba6a754e42a6cc7771fdfee190>:0 
MySql command callback raised an exception (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.BetterStatistics+<Startup>c__Iterator0.<>m__0 (System.Collections.Generic.List`1[T] list) [0x00010] in <ba3b5e1a0566428b94ae3e592247fe22>:0 
  at Oxide.Core.MySql.Libraries.MySql+MySqlQuery+<>c__DisplayClass24_0.<Handle>b__0 () [0x0005d] in <021a1dba6a754e42a6cc7771fdfee190>:0 

This is due to your mysql version.

Changed Status from Pending to Not a Bug

check this I have the mysql working with that error resolved.