求帮助myBatis sqlMap foreach 对象中的list传入，报错

myBatis sqlMap foreach 对象中的list传入，报错，再此向各位高手求帮助
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.reflection.ReflectionException: There is no getter for property named “__frch_item_0” in “class com.asiacloud.core.model.PageModel”
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:368)
at $Proxy6.selectList(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:198)
at com.asiacloud.core.base.dao.impl.BaseDaoImpl.select(BaseDaoImpl.java:74)
at com.asiacloud.syse.unitaccount.dao.impl.TSyseMaintainAccountDaoImpl.queryListByUnitIdPage(TSyseMaintainAccountDaoImpl.java:107)
action中的代码

...
private PageModel page = new PageModel();
...
tSyseMaintainAccount.setIdList(idList);
				tSyseMaintainAccount.setId(loginId);
				page.setParams(tSyseMaintainAccount);
				page = iTSyseMaintainAccountService.queryListByUnitIdPage(page);

sqlMap文件：

<select id="queryListByUnitIdPage" parameterType="TSyseMaintainAccount" resultMap="TSyseMaintainAccountResultMap">
		select a.*,b.UNIT_NAME linkUnitName from T_SYSE_MAINTAIN_ACCOUNT a
		left JOIN T_SYSE_OPER_UNIT b
		on a.UNIT_ID=b.ID
		where a.STATUS_FLAG in ("1","2")
		AND a.UNIT_ID in  
			<foreach item="item" index="index" collection="params.idList" open="(" separator="," close=")">  
                       #{item}  
            </foreach> 
        AND a.ID != #{params.id}
	</select>

TSyseMaintainAccount类：

public class TSyseMaintainAccount implements java.io.Serializable {
	// Fields
	private Long id;
	private String name;
...
	private List idList;
	public List getIdList() {
		return idList;
	}
	public void setIdList(List idList) {
		this.idList = idList;
	}
}

PageModel类

public class PageModel {
...
private Object params;
public Object getParams() {
		return params;
	}
	public void setParams(Object params) {
		this.params = params;
	}
...
}