question

Hello sir, I am getting this error

"Level": "Info",

CloudScript:

log.info("TrackerInfo: " + tracker + " Tracker: " + parseInt(tracker[TRACKER_NEXT_GRANT])); 



Response:         
"Message": "TrackerInfo: {\"LoginStreak\":1,\"NextEligibleGrant\":1582314383681} Tracker: NaN",
"Data": null

handlers.CheckIn = function(args) {


	var GetUserReadOnlyDataRequest = {
        "PlayFabId": currentPlayerId,
        "Keys": [ CHECK_IN_TRACKER ]
    }; 
    var GetUserReadOnlyDataResponse = server.GetUserReadOnlyData(GetUserReadOnlyDataRequest);
    
    // need to ensure that our data field exists
    var tracker = {}; // this would be the first login ever (across any title), so we have to make sure our record exists.
    if(GetUserReadOnlyDataResponse.Data.hasOwnProperty(CHECK_IN_TRACKER))
    {
    	tracker = JSON.parse(GetUserReadOnlyDataResponse.Data[CHECK_IN_TRACKER].Value);
    	var nextGrant = JSON.parse(tracker);
    //	var d = JSON.parse(tracker);
    //	var e = d[TRACKER_NEXT_GRANT];
    }
    else
    {
    	tracker = ResetTracker();
  		
  		// write back updated data to PlayFab
  		UpdateTrackerData(tracker);


  		log.info("This was your first login, Login tomorrow to get a bonus!");
  		return JSON.stringify([]);
    }
	


	if(Date.now() > parseInt(nextGrant[TRACKER_NEXT_GRANT]))
	{	
		// Eligible for an item grant.
		//check to ensure that it has been less than 24 hours since the last grant window opened
		var timeWindow = new Date(parseInt(tracker[TRACKER_NEXT_GRANT]));
		timeWindow.setDate(timeWindow.getDate() + 1); // add 1 day 


		if(Date.now() > timeWindow.getTime())
		{
			// streak ended :(			
			tracker = ResetTracker();
			UpdateTrackerData(tracker);


			log.info("Your consecutive login streak has been broken. Login tomorrow to get a bonus!");
			return JSON.stringify([]);
		}


		// streak continues
		nextGrant[TRACKER_LOGIN_STREAK] += 1;
		var dateObj = new Date(Date.now());
		dateObj.setDate(dateObj.getDate() + 1); // add one day 
		nextGrant[TRACKER_NEXT_GRANT] = dateObj.getTime();


		// write back updated data to PlayFab
		log.info("Your consecutive login streak increased to: " + nextGrant[TRACKER_LOGIN_STREAK]);
		UpdateTrackerData(JSON.stringify(nextGrant));


		// Get this title's reward table so we know what items to grant. 
		var GetTitleDataRequest = {
	    	"Keys": [ PROGRESSIVE_REWARD_TABLE ]
	    }; 
	    var GetTitleDataResult = server.GetTitleData(GetTitleDataRequest);
	    
	    // ---
	    if(!GetTitleDataResult.Data.hasOwnProperty(PROGRESSIVE_REWARD_TABLE))
	    {
	    	log.error("Rewards table could not be found. No rewards will be given. Exiting...");
	        return JSON.stringify([]);
	    }
	    else
	    {
	    	// parse our reward table
	    	var rewardTable = JSON.parse(GetTitleDataResult.Data[PROGRESSIVE_REWARD_TABLE]);
	    	
	    	// find a matching reward 
	    	var reward;
	    	for(var level in rewardTable)
	    	{
	    		if( nextGrant[TRACKER_LOGIN_STREAK] >= rewardTable[level][PROGRESSIVE_MIN_CREDITS])
	    		{
	    			reward = rewardTable[level][PROGRESSIVE_REWARD];
	    		}
	    	}


	    	// make grants and pass info back to the client.
			var grantedItems = [];
	    	if(reward)
			{
				grantedItems = GrantItems2(reward, nextGrant[TRACKER_LOGIN_STREAK]);
			}
			return grantedItems;
	    }
	}


	return JSON.stringify([]);
};




function ResetTracker()
{
	var reset = {};


	reset[TRACKER_LOGIN_STREAK] = 1;
	
	var dateObj = new Date(Date.now());
	dateObj.setDate(dateObj.getDate() + 1); // add one day 


	reset[TRACKER_NEXT_GRANT] = dateObj.getTime();
	return JSON.stringify(reset);
}




function UpdateTrackerData(data)
{
    var UpdateUserReadOnlyDataRequest = {
        "PlayFabId": currentPlayerId,
        "Data": {}
    };
    UpdateUserReadOnlyDataRequest.Data[CHECK_IN_TRACKER] = JSON.stringify(data);


    server.UpdateUserReadOnlyData(UpdateUserReadOnlyDataRequest);
}


function UpdateTrackerData2(data)
{
    var UpdateUserReadOnlyDataRequest = {
        "PlayFabId": currentPlayerId,
        "Data": {}
    };
    UpdateUserReadOnlyDataRequest.Data[CHECK_IN_TRACKER] = data;


    server.UpdateUserReadOnlyData(UpdateUserReadOnlyDataRequest);
}


function GrantItems2(items, count)
{
	log.info("Granting: " + items);
    var parsed = Array.isArray(items) ? items : [ items ];


    var GrantItemsToUserRequest = {
        "PlayFabId" : currentPlayerId,
        "ItemIds" : parsed,
        "Annotation" : "Granted for logging in over " + count + " consecutive days.",
        "CatalogVersion" : "1"
    };


    var GrantItemsToUserResult = server.GrantItemsToUser(GrantItemsToUserRequest);
    return JSON.stringify(GrantItemsToUserResult.ItemGrantResults);


}

This is the script fixed and working