File “c:\users\apte\.platformio\penv\lib\site-packages\serial\__init__.py”, line 88, in serial_for_url
instance.open()
File “c:\users\apte\.platformio\penv\lib\site-packages\serial\serialwin32.py”, line 62, in open
raise SerialException(“could not open port {!r}: {!r}”.format(self.portstr, ctypes.WinError()))
serial.serialutil.SerialException: could not open port ‘COM9’: PermissionError(13, ‘Access is denied.’, None, 5)
*** [uploadfs] Error 1
========================================================= [FAILED] Took 6.46 seconds =========================================================
The terminal process “C:\Users\APTE\.platformio\penv\Scripts\pio.exe ‘run’, ‘–target’, ‘uploadfs’, ‘–environment’, ‘esp12e'” terminated with exit code: 1.
Terminal will be reused by tasks, press any key to close it

Hi.
That happens when you are trying to upload the filesystem image, right?
That error happens because you have a serial connection opened with the board, and it is not able to upload the files.
You need to close all serial connections. 
Click on the dustbin icon to close all connections. You may need to click several times.

Let me know if this solves your issue.
Regards,
Sara

Dear Madam,
Thank you very much. Problem is resolved.

Great!
I’ll mark this issue as resolved.
If you need further help, you just need to open a new question in our forum.
Regards,
Sara