WinAppDriver: Error raised when launching the app: Specify either app or appTopLevelWindow to create a session

I am trying to launch my test with the following capabilities:

{
  "capabilities": {
    "firstMatch": [
      {
        
      }
    ],
    "alwaysMatch": {
      "appium:app": "C:\\AeroScoutEngineManager\\bin\\Rte\\EngineManager.exe",
      "appium:winAppDriverHost": "127.0.0.1:4723",
      "platformName": "Windows",
      "appium:platformVersion": "10",
      "appium:automationName": "Windows",
      "appium:appArguments": "ShellLayout.xml ShellCnf.xml",
      "appium:appWorkingDir": "c:\\AeroScoutEngineManager\\bin\\Rte"
    }
  }
}

My application must be launched with the arguments above. from that specific path.

The error I am getting is:

Windows Application Driver listening for requests at: http://127.0.0.1:4723/
Press ENTER to exit.


==========================================
POST /session HTTP/1.1

Accept: application/json

Accept-Encoding: identity

Connection: keep-alive

Content-Length: 387

Content-Type: application/json;charset=UTF-8

Host: 127.0.0.1:4723

User-Agent: appium/python 2.6.0 (selenium/4.3.0 (python windows))

X-Idempotency-Key: 4479771e-d340-492a-9486-c96fe20d15c2



{"capabilities": {"firstMatch": [{}], "alwaysMatch": {"appium:app": "C:\\AeroScoutEngineManager\\bin\\Rte\\EngineManager.exe", "appium:winAppDriverHost": "127.0.0.1:4723", "platformName": "Windows", "appium:platformVersion": "10", "appium:automationName": "Windows", "appium:appArguments": "ShellLayout.xml ShellCnf.xml", "appium:appWorkingDir": "c:\\AeroScoutEngineManager\\bin\\Rte"}}}
HTTP/1.1 400 Bad Request

Content-Length: 141

Content-Type: application/json



{"status":100,"value":{"error":"invalid argument","message":"Bad capabilities. Specify either app or appTopLevelWindow to create a session"}}


==========================================
POST /session HTTP/1.1

Accept: application/json

Accept-Encoding: identity

Connection: keep-alive

Content-Length: 387

Content-Type: application/json;charset=UTF-8

Host: 127.0.0.1:4723

User-Agent: appium/python 2.6.0 (selenium/4.3.0 (python windows))

X-Idempotency-Key: e71805eb-5c48-40b8-8a38-c45b801d244d



{"capabilities": {"firstMatch": [{}], "alwaysMatch": {"appium:app": "C:\\AeroScoutEngineManager\\bin\\Rte\\EngineManager.exe", "appium:winAppDriverHost": "127.0.0.1:4723", "platformName": "Windows", "appium:platformVersion": "10", "appium:automationName": "Windows", "appium:appArguments": "ShellLayout.xml ShellCnf.xml", "appium:appWorkingDir": "c:\\AeroScoutEngineManager\\bin\\Rte"}}}
HTTP/1.1 400 Bad Request

Content-Length: 141

Content-Type: application/json



{"status":100,"value":{"error":"invalid argument","message":"Bad capabilities. Specify either app or appTopLevelWindow to create a session"}}
==========================================

What is the problem?

Thanks!