Requires objectvalue or nullvalue error

#include <iostream>
#include <json json.h="">
using namespace std;

#define ACTIVE "active"

class Test
{
    public:
    void testFun(Json::Value& payload)
    {
        if(payload.isMember(ACTIVE))
        {
            bool val = payload[ACTIVE].asBool();
        }
        else
        {
            std::cout<<"Not found"<<std::endl;
        }
    }
}

int main()
{
 test obj;
 json::value payload;
 payload["timestamp"]="12345" ;
 payload["keytimestamp"]="23456" payload["active"]="true;
 payload["data"]="payload" payload["command"]="put" 
 obj.testfun(payload);
}

c++ exception with description "in json::value::find(key,end,found: requires objectvalue or nullvalue" thrown in body.

#include <iostream>
#include <json json.h="">
using namespace std;

#define ACTIVE "active"

class Test
{
    public:
    void testFun(Json::Value& payload)
    {
        if(payload.isMember(ACTIVE))
        {
            bool val = payload[ACTIVE].asBool();
        }
        
        else
        {
            std::cout<<"Not found"<