Error Uploading

Help!!!

After verifying codes, When I tried uploading, it says "Error uploading, check if the selected board is currently available". I have selected right Arduino/ Genuino Uno and port 3. Still it keep showing error message

Debug Console report.

It says {"Port" : []," Network" : false}
{"Port" : []," Network" : true}
list
{"Port" : []," Network" : false}
{"Port" : []," Network" : true}
list
{"Port" : []," Network" : false}
{"Port" : []," Network" : true}

Please find the attachment

Regards

Rajesh