VarAC fails connection and automatically opens multiple instances of itself.

Upon opening the VarAC program and attempting to connect I get this failure message, and then the program opens another instance of itself automatically every few seconds. I then have many many instances of the program running and need to shut down.

28/03/2022 12:14:56 - Connecting VARA Main Modem data stream...

28/03/2022 12:14:57 - Connecting VARA Main Modem Command interface...

28/03/2022 12:14:57 - Starting VarAC

28/03/2022 12:14:57 - Unable to send command to Com port. Closing port

28/03/2022 12:14:57 - Access to the port 'COM11' is denied.

at System.IO.Ports.InternalResources.WinIOError(Int32 errorCode, String str)

at System.IO.Ports.SerialStream..ctor(String portName, Int32 baudRate, Parity parity, Int32 dataBits, StopBits stopBits, Int32 readTimeout, Int32 writeTimeout, Handshake handshake, Boolean dtrEnable, Boolean rtsEnable, Boolean discardNull, Byte parityReplace)

at System.IO.Ports.SerialPort.Open()

at VarAC.VarAC.cat_command(String cmd)

Any help is appreciated. Thanks!