App Source Could not obtain source: [object Object]

Hi guys, I got some message when I m trying to use Appium Inspector. Basically I got this message in the Appium Inspector itself.

Appium version-1.2.2

{
“deviceName”: “My Phone”,
“udid”: “4d06679958b060d9”,
“platformName”: “android”,
“platformVersion”: “5.0.1”,
“appPackage”: “com.android.vending”,
“appActivity”: “com.google.android.finsky.activities.MainActivity”,
“noReset”: true
}

Could not obtain source: {“cause”:{“sessionId”:“a35025d1-184d-4963-b1f1-f268fc9688dd”,“status”:13,“value”:{“message”:“An unknown server-side error occurred while processing the command.”}},“jsonwire-error”:{“detail”:“An unknown server-side error occurred while processing the command.”,“status”:13,“summary”:“UnknownError”},“message”:"[source()] Error response status: 13, , UnknownError - An unknown server-side error occurred while processing the command. Selenium error: An unknown server-side error occurred while processing the command.",“status”:13}