I am unable to locate the elements in the webview when connected with android real devices

Hi all,
my environment details are as below
The application is developed with agular ionic2
It is a hybrid app
Appium version 1.4.16.1
android version 6(nougat)
device Samsung tab S3
device type real device connected via USB cable.
i am able to inspect all the elements in the application using uiautomatorviewer, each and every element is able to locate. But when i run my script the code is stuck at switch context.
kindly see the error displayed in appium log below

error: Failed to start an Appium session, err was: Error: Could not proxy command to remote server. Original error: Error: connect ECONNREFUSED

info: [debug] Error: Could not proxy command to remote server. Original error: Error: connect ECONNREFUSED

Can someone help me to resolve this issue? Please revert in case further information is needed.