beetle在Map遍历时报错?报错

<--:var dictType=col.dictType; // dict_boolean

for(kvMap in dict[dictType]){

    var key = kvMap.key;
    var value = kvMap.value;
--> <option value="${key}">${value}</option> <--: } -->

返回的数据是这个样子的 dict {"dict_boolean":{"AAB001":"是","AAB002":"否"} }

java.lang.NoSuchMethodException: java.util.HashMap$Node.setKey(java.lang.Object)

at java.lang.Class.getMethod(Class.java:1786)
at org.beetl.core.om.PojoMethodInvoker.checkSetterMethod(PojoMethodInvoker.java:126)
at org.beetl.core.om.PojoMethodInvoker.<init>(PojoMethodInvoker.java:52)
at org.beetl.core.om.ObjectUtil.getInvokder(ObjectUtil.java:171)
at org.beetl.core.om.ObjectAA.value(ObjectAA.java:101)
at org.beetl.core.statement.VarAttribute.evaluate(VarAttribute.java:61)
at org.beetl.core.statement.VarRef.evaluate(VarRef.java:127)