"forcing MSVC stacktrace to show which T we're talking about." error

[A-Starfinder]

Hello, I am a beginner at c++ and get this error message, when I try to run my code:

Error C2338 forcing MSVC stacktrace to show which T we're talking about. ConsoleRPG c:...\nlohmann\json.hpp 1207
Error C2065 "force_msvc_stacktrace": undeclared identifier ConsoleRPG c:...\nlohmann\json.hpp 1206
Error C2039 "force_msvc_stacktrace": is not a member of "Item" ConsoleRPG c:...\nlohmann\json.hpp 1206
Error C2338 could not find from_json() method in T's namespace ConsoleRPG c:...\nlohmann\json.hpp 1202

I already read this thread: #929

I could still not locate the error.

The only thing I assign to json values is like this:
nlohmann::json itemJ = json::parse("string")
or having them as parameters in functions.

[A-Starfinder]

I am using Visual Studio 2017

[nlohmann]

How does the exact code look like? The above error message is not triggered by parsing, but by trying to assign some user-defined object to json.

[gregmarr]

@nlohmann The error was from_json, not to_json, so it is indeed caused by parsing.

[nlohmann]

@gregmarr Right. Then it was an assignment from json to a user-defined object. But this is not an issue in the deserialization process (what I mean with "parsing").

[A-Starfinder]

Ok, here all parts of the code, where I use nlohmann::json , sorry if my code is bad, but I am still a beginner and not used to c++:

bool ItemLoader::loadItems()
{
	std::ifstream itemFile("SaveFiles/items.json");
	if (!itemFile.is_open()) return false;
	json itemJ = json::parse(itemFile);
	int i = 0;
	while (!itemJ["Items"][i].is_null())
	{
		addItem(itemJ, i);
		i++;
	}
	itemFile.close();
	return true;
}

void ItemLoader::addItem(json itemJ, int i)
{
	Item item;

	item.id = itemJ["Items"][i]["ID"];
	item.itemName = itemJ["Items"][i]["Name"];
	item.weight = itemJ["Items"][i]["weight"];
	item.itemClass = itemClassParser(itemJ["Items"][i]["ItemClass"]);
	item.itemRarity = itemRarityParser(itemJ["Items"][i]["ItemRarity"]);
	item.itemAbilities = createAbilityVector(itemJ, i);

	if (item.itemClass == ItemClass::chestplate || item.itemClass ==  ItemClass::gloves || item.itemClass == ItemClass::headgear || item.itemClass == ItemClass::legs) item.defense = itemJ["Items"][i]["defense"];
	else if (item.itemClass == ItemClass::weapon || item.itemClass == ItemClass::magicalWeapon) {
		item.physicalAttack = itemJ["Items"][i]["physicalAttack"];
		item.magicAttack = itemJ["Items"][i]["magicAttack"];
		item.weaponType = weaponTypeParser(itemJ["Items"][i]["weaponType"]);
		item.ranged = itemJ["Items"][i]["ranged"];
	}

	items.push_back(item);

	return;
}

std::vector<ItemAbility> ItemLoader::createAbilityVector(json itemJ, int i)
{
	std::vector<ItemAbility> abilities;
	int c = 0;
	while (!itemJ["Items"][i]["abilities"][c].is_null())
	{
		ItemAbility ability;

		ability.abilityType = itemAbilityTypeParser(itemJ["Items"][i]["abilities"][c]["AbilityType"]);

		if (ability.abilityType == ItemAbilityType::statIncrease) {

			ability.statToIncrease = itemJ["Items"][i]["abilities"][c]["statToIncrease"];
			ability.increasingAmount = itemJ["Items"][i]["abilities"][c]["increasingAmount"];

			abilities.push_back(ability);
		}
		else if (ability.abilityType != ItemAbilityType::none){
			ability.abilityFile = itemJ["Items"][i]["abilities"][c]["abilityFile"];
		}
		abilities.push_back(ability);
		c++;
	}
	return abilities;
}

character::character()
{
	characterFile = "SaveFiles/character.json";
	loadCharacter();
}

bool character::loadCharacter()
{
	std::ifstream charFile(characterFile);
	if (!charFile.is_open()) return false;
	json charJ = json::parse(charFile);

	//load Status
	status.agility = charJ["Status"]["agility"];
	status.attributePoints = charJ["Status"]["attributePoints"];
	status.charisma = charJ["Status"]["charisma"];
	status.intelligence = charJ["Status"]["intelligence"];
	status.luck = charJ["Status"]["luck"];
	status.perception = charJ["Status"]["perception"];
	status.skill = charJ["Status"]["skill"];
	status.spiritAffinity = charJ["Status"]["spiritAffinity"];
	status.spiritArmor = charJ["Status"]["spiritArmor"];
	status.spiritEnergy = charJ["Status"]["spiritEnergy"];
	status.strength = charJ["Status"]["strength"];
	status.vitality = charJ["Status"]["vitality"];
	status.wisdom = charJ["Status"]["wisdom"];

	level = charJ["level"];
	attackMultiplier = charJ["Attack Multiplier"];
	name = charJ["name"];

	int count = 0;

	while (!charJ["inventory"][count].is_null()) {
		addItem(charJ["inventory"][count]);
		count++;
	}

	equipItem(charJ["Equipment"]["headgear"]);
	equipItem(charJ["Equipment"]["chestplate"]);
	equipItem(charJ["Equipment"]["gloves"]);
	equipItem(charJ["Equipment"]["legs"]);
	equipItem(charJ["Equipment"]["weapon1"]);
	equipItem(charJ["Equipment"]["weapon2"], 2);

	charFile.close();
	return true;
}

[nlohmann]

Then I would need to understand how, for instance, the Item class looks like. As debugging steps, could you try to comment the assignments from json to other types - maybe the error disappears and you can find the failing line when you remove the comments one by one?

[A-Starfinder]

Ok, solved it. The error was on my side. Thank you a lot for your help and explaining the error.

[nlohmann]

Thanks for checking back!