Error: Could not sign with default certificate

i have been using Appium desktop. and when i set desired capability to “automationName”: “UiAutomator2”.

getting the below error
[MJSONWP] Encountered internal error running command: Error: Could not sign with default certificate. Original error Command ‘‘C:\Program Files\Java\jdk1.8.0_181\bin\java.exe’ -jar ‘C:\Program Files (x86)\Appium\resources\app\node_modules\appium\node_modules\appium-adb\jars\sign.jar’ ‘C:\Program Files (x86)\Appium\resources\app\node_modules\appium\node_modules\appium-uiautomator2-server\apks\appium-uiautomator2-server-v1.12.0.apk’ --override’ exited with code 1

Any help oh how to resolve this issue