Mybatis报错ReflectionException: There is no getter for property named xxx in 'class [Ljava.lang.Object;'。 已加@Param注解

Mapper:
List queryBusiNum(@Param(“isMonth”) String isMonth,
@Param(“month”) String month,
@Param(“busiType”) String busiType);
XML:

<select id="queryBusiNum" resultType="java.lang.String">
    select concat(concat(region,':'),count(busitype))
    from busi_info_table where source = '2' and busitype = #{busiType}
    <choose>
      <when test="isMonth == '1'.toString()">
      </when>
      <otherwise>
      </otherwise>
    </choose>
    group by region
</select>

报错信息:org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.reflection.ReflectionException: There is no getter for property named ‘isMonth’ in ‘class [Ljava.lang.Object;’

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