Estou usando o MyBatis Generator no eclipse. Aqui está o arquivo generatorConfig.xml. Quando clico com o botão direito do mouse e escolho "gerar artefatos MyBatis", ele me mostra a mensagem de erro como "O padrão do nome da coluna não pode ser NULL ou vazio".

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <classPathEntry
        location="C:\Users\myplace\.m2\repository\mysql\mysql-connector-java\6.0.2\mysql-connector-java-6.0.2.jar" />
  <context id="context1">
  <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
        <plugin type="org.mybatis.generator.plugins.ToStringPlugin" />
  <jdbcConnection driverClass="com.mysql.jdbc.Driver"
            connectionURL="jdbc:mysql://localhost:3306/world?serverTimezone=EST"
            userId="root" password="root" />
    <javaModelGenerator targetPackage="com.example.ws.model" targetProject="com.example.ws" />
    <sqlMapGenerator targetPackage="com.example.ws.sql" targetProject="com.example.ws" />
   <javaClientGenerator targetPackage="com.example.ws.mapper" targetProject="com.example.ws" type="ANNOTATEDMAPPER" />
    <table schema="world" tableName="city">
      <columnOverride column="ID" property="id" javaType = "Integer" />
      <columnOverride column="Name" property="name" javaType = "String" />
      <columnOverride column="CuntryCode" property="cuntryCode" javaType = "String" />     
      <columnOverride column="District" property="district" javaType = "String" />
      <columnOverride column="Population" property="population" javaType = "BigDecimal" />
     </table>
  </context>
</generatorConfiguration>

Você poderia me ajudar com isso? Obrigado!