Unable to find elements using UI Automator in android

Support
1

Out of 5 devices, I am unable to locate the elements using UI Automator.
Getting following error in some devices "Error while obtaining UI hierarchy XML file: com.android.ddmlib.SyncException: Remote object doesn’t exist!
Error while obtaining UI hierarchy XML file: com.android.ddmlib.SyncException: Remote object doesn’t exist!
"
But for some devices able to fetch the same element.