I followed the video to create a custom dataeditor but when I try to enter the char limit on the data type I get the following exception:

Error running NonQuery: 
SQL Statement:
insert into cmsDataTypePreValues (datatypenodeid, [value], sortorder, alias) values (@dtdefid, @value,0,' '))

Exception:
System.Data.SqlServerCe.SqlCeException: There was an error parsing the query. [ Token line number = 1,Token line offset = 109,Token in error = ) ]
  at System.Data.SqlServerCe.SqlCeCommand.ProcessResults(Int32 hr)
  at System.Data.SqlServerCe.SqlCeCommand.CompileQueryPlan()
  at System.Data.SqlServerCe.SqlCeCommand.ExecuteCommand(CommandBehavior behavior, String method, ResultSetOptions options)
  at System.Data.SqlServerCe.SqlCeCommand.ExecuteNonQuery()
  at SqlCE4Umbraco.SqlCeApplicationBlock.ExecuteNonQuery(String connectionString, CommandType commandType, String commandText, SqlCeParameter[] commandParameters)

Any ideas?