Can't use $elemMatch" - mysql

Question

When i am trying to hit the api for this part of code on postman i get error of Can't use $elemMatch I search but can't find any solution for that:-
const accessChat = asyncHandler(async (req, res) => {
const { userId } = req.body;
if (!userId) {
return res.status(400).json({err:'UserId param not sent with request'});
}
var isChat = await Chat.find({
isGroupChat: false,
$and: [
{ users: { $elemMatch: { $eq: req.user._id } } },
{ users: { $elemMatch: { $eq: userId } } },
],
})
.populate("users", "-password")
.populate("latestMessage");
isChat = await User.populate(isChat, {
path: "latestMessage.sender",
select: "name pic email",
});
if (isChat.length > 0) {
res.send(isChat[0]);
} else {
var chatData = {
chatName: "sender",
isGroupChat: false,
users: [req.user._id, userId],
};
try {
const createdChat = await Chat.create(chatData);
const FullChat = await Chat.findOne({ _id: createdChat._id }).populate(
"users",
"-password"
);
res.status(200).json(FullChat);
} catch (error) {
res.status(400);
throw new Error(error.message);
}
}
});
Error image is attached
https://i.stack.imgur.com/HXvTR.png