How to resolve this below error

How to resolve this error. Please can anyone help me out so that it will help me alot in my project

[Jan]

Please post the message as text. It is horrible to read the screenshot with scrolling in different directions.

Please be careful with the personal details you publish in the net:

I've replaced the image by a more readable version and removed the personal data.

Answer 1

[Jan]

The error message tells all known details already. COM4 is not available. Other ports are not availaible also. Matlab suggests to use instrfind. So did you try this already?

[Madhumitha Vanamala]

No

[Jan]

Why not? If the error message suggests a way to solve the problem, us this valuable hint.

[Madhumitha Vanamala]

Sure I will solve