Appium/WinAppDriver Session Creation Error: "Missing command parameter: appId"

Miscellaneous
1

Hello everyone,

I’m running into an issue while trying to start a new Appium session using WinAppDriver for a Windows application, and I’m looking for some help.

The Problem

The session creation request is failing with an HTTP/1.1 400 Bad Request and the specific error message:

JSON

{"status":100,"value":{"error":"invalid argument","message":"Missing command parameter: appId

Any guidance on the correct capabilities to use to launch a classic Windows desktop application, Thanks!

image
image1176×783 57.5 KB

image
image1099×629 20.1 KB

2 Likes
2

katalon version? same error for both appium as well winapp driver?

1 Like
3

To avoid the “Missing command parameter: appId” error, always set the app capability with the correct executable path or app identifier in your WinAppDriver session capabilities

json

{
  "app": "C:\\Path\\To\\YourApp.exe"
}

or for system apps,

json

{
  "app": "Microsoft.WindowsCalculator_8wekyb3d8bbwe!App"
}

Sample Desired Capabilities (for a classic Win32 app)

json

{
  "platformName": "Windows",
  "deviceName": "WindowsPC",
  "app": "C:\\Path\\To\\YourApp.exe"
}

Example for Notepad:

json

{
  "platformName": "Windows",
  "deviceName": "WindowsPC",
  "app": "C:\\Windows\\System32\\notepad.exe"
}
1 Like
4

From v10.3.0, Katalon Studio supports FlaUI instead of WinAppDriver. Please refer here for more details: Desktop applications testing with FlaUI driver in Katalon Studio | Katalon Docs

2 Likes
5

let us know if your issue is resolved or not

1 Like