Problem uploading a code

I tried uploading MPU code on Arduino Uno, its compiling but not uploading !

Any suggestions ?
Below is the Error message

Arduino: 1.8.0 (Windows 10), Board: "Arduino/Genuino Uno"

Sketch uses 11382 bytes (35%) of program storage space. Maximum is 32256 bytes.
Global variables use 906 bytes (44%) of dynamic memory, leaving 1142 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "\.\COM7": The system cannot find the file specified.

Problem uploading to board. See for suggestions.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

So is COM7 the correct port? What does device manager say when you connect/disconnect the board?