Error when using postman

Artificial Intelligence Generative AI
#1

When I use the weather app, I get an error.

{
“message”: “MCP error -32603: Cannot read properties of undefined (reading ‘_zod’)”,
“source”: “message”
}

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#2

I’m taking it this is for one of the MCP courses. Could you please supply a link to the lecture or the lab?

#3

https://learn.kodekloud.com/user/courses/mcp-for-beginners/module/ef6da233-05e8-4813-b17a-52f829e130f1/lesson/78ea582a-7545-4c5e-b119-e75dafc64057

#4

First, make sure you have reasonable latitude and longitude. You can use Google Search to get your current location, which will give you the number as LATITUTDE, LONGITUDE. You’ve gotten postman to interact with Jeremy’s MCP server, so it should just work to fill things in.

Your coordinates appear to be those for Berlin, Germany, and they work for me:

{
  "method": "tools/call",
  "params": {
    "name": "get_current_weather",
    "arguments": {
      "latitude": 52.52,
      "longitude": 13.41
    }
  }
}

for which the MCP server in Postman returns

{
    "content": [
        {
            "type": "text",
            "text": "{\n  \"time\": \"2025-12-01T23:15\",\n  \"interval\": 900,\n  \"temperature_2m\": 0.8,\n  \"wind_speed_10m\": 9.9,\n  \"relative_humidity_2m\": 83,\n  \"weather_code\": 3\n}"
        }
    ]
}

So I’m not sure why you’re getting an error; might be network related where you can’t hit the API server for some reason.