Serial communication with device error

Good day, I'm trying to serially communicate with my FT232RL via COM1 port, however I keep getting an error. This is my code:

close all;

clc;

if ~isempty(instrfind)

fclose(instrfind);

delete(instrfind);

end

s= serialport("COM1",9600);

fopen(s);

And this is my error:

Error using serialport (line 116)

Unable to connect to the serialport device at port 'COM1'. Verify

that a device is connected to the port, the port is not in use,

and all serialport input arguments and parameter values are

supported by the device.

Error in Serial (line 9)

s= serialport("COM1",9600);

I have however been able to communicate to the device through MPLAB x, however for some reason MATLAB doesn't seem to pick it up. Help would be much appreciated!

Answer 1

[Leon Ellis]

Solved: I just had to delete or close to variable each time.