Arduino stuck on upload

I am trying to communicate between an Arduino and a Qt-based executable, both of which use the communication port. In order to upload the code to the Arduino, I normally have to terminate the aforementioned executable. However, today, after terminating the executable, I attempted to upload the code to the Arduino. This is the message I received. This comes after the "Sketch uses" message.

C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -carduino -PCOM3 -b115200 -D -Uflash:w:C:\Users\Dummie1138\AppData\Local\Temp\arduino_build_635364/456_Arduino_String.ino.hex:i 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"

         Using Port                    : COM3
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200

I am not sure why this is occurring; normally if I forget to terminate the executable, the Arduino just tells me COM3 is being used. I am unsure how to proceed as I haven't been able to find a way to determine exactly what (if anything) is using COM3 at the moment. Please let me know if more information is required.

If it is Windows 10, type "Device Manager" into search box near the Start Icon, and look for "Ports"

I can't see any error in your output, just some information strings. Anyway which arduino we're talking about? What IDE version and OS? How is the IDE configured (board, programmer and COM port)? Does the COM port has been selected on the "Port" IDE menu? Is it the same shown on "Device manager" (as suggested by 6v6gt)?

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