“Unable to connect to adb. Check if adb is installed correctly.” message appears when try to take screen shot in UIautomator viewer.
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open terminal and type adb and check if you have a result if yes you need to check ADROID_HOME or something like that if no you need to install android again 
thanks bilal, it’s resolved now.
when i am doing adb devices. it is displaying device but when i am connecting with uiautomatorviewer it is giving error unable to connect with adb.