The binary operator Equal is not defined for the types 'System.Text.Json.JsonElement' and 'System.String'.

[AMarburger]

I've downloaded the latest version of this repo and am running it locally.
I began to debug the code to understand how it works, and I noticed a series of exceptions being thrown (see RuleResultTree.ExecptionMessage below).

Just in case I did not understand how this was supposed to work, I updated the basicInfo in the JSONDemo to ensure one of the rules would come back as true, but I continued to get the same error messages.

Anyone have any suggestions to get this to run?

JSONDemo.cs
var basicInfo = "{"name": "hello","email": "abcy@xyz.com","creditHistory": "good","country": "canada","loyaltyFactor": 3,"totalPurchasesToDate": 10000}";

var basicInfo = "{"name": "hello","email": "abcy@xyz.com","creditHistory": "good","country": "india","loyaltyFactor": 3,"totalPurchasesToDate": 10000}";

Discount.json
"WorkflowName": "Discount",
"Rules": [
{
"RuleName": "GiveDiscount10",
"SuccessEvent": "10",
"ErrorMessage": "One or more adjust rules failed.",
"ErrorType": "Error",
"RuleExpressionType": "LambdaExpression",
"Expression": "input1.country == "india" AND input1.loyaltyFactor <= 2 AND input1.totalPurchasesToDate >= 5000 AND input2.totalOrders > 2 AND input3.noOfVisitsPerMonth > 2"
},
{
"RuleName": "GiveDiscount20",
"SuccessEvent": "20",
"ErrorMessage": "One or more adjust rules failed.",
"ErrorType": "Error",
"RuleExpressionType": "LambdaExpression",
"Expression": "input1.country == "india" AND input1.loyaltyFactor == 3 AND input1.totalPurchasesToDate >= 10000 AND input2.totalOrders > 2 AND input3.noOfVisitsPerMonth > 2"
},
{
"RuleName": "GiveDiscount25",
"SuccessEvent": "25",
"ErrorMessage": "One or more adjust rules failed.",
"ErrorType": "Error",
"RuleExpressionType": "LambdaExpression",
"Expression": "input1.country != "india" AND input1.loyaltyFactor >= 2 AND input1.totalPurchasesToDate >= 10000 AND input2.totalOrders > 2 AND input3.noOfVisitsPerMonth > 5"
}
]

RuleResultTree.ExecptionMessage
Exception while parsing expression input1.country == "india" AND input1.loyaltyFactor <= 2 AND input1.totalPurchasesToDate >= 5000 AND input2.totalOrders > 2 AND input3.noOfVisitsPerMonth > 2 - The binary operator Equal is not defined for the types

[Knicker]

I had the same problem, I think it happened after they changed the NewtonSoft.Json for System.Text.Json:

I made a PR with changes that work for me:
https://github.com/microsoft/RulesEngine/pull/672/files