Upload script trouble - Port busy error


Dear SenseBox team,
I have a trouble to upload script - I am trying the very basic Blink one.
I had an error message as “port busy”
I have installed, and now also re-installed, the Arduino 1.8.7 under Windows 10. (using the zip as indicated in the Instructions)
I used the most updated versions in Board manager tool, and also the ones suggested in this thema

But I dont manage to upload.

I am able to “read” the information of the board with Get tools -> Get Board Info, so I guess there is not a trouble of the driver.

Any suggestion?

thanks a lot in advance.
kind regards,

------- here the info by trying the upload
Sketch uses 10240 bytes (3%) of program storage space. Maximum is 262144 bytes.
at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences(SerialUploader.java:152)
at cc.arduino.UploaderUtils.upload(UploaderUtils.java:77)
at processing.app.SketchController.upload(SketchController.java:732)
at processing.app.SketchController.exportApplet(SketchController.java:703)
at processing.app.Editor$UploadHandler.run(Editor.java:2047)
at java.lang.Thread.run(Thread.java:748)
Caused by: processing.app.SerialException: Error touching serial port ‘COM9’.
at processing.app.Serial.touchForCDCReset(Serial.java:107)
at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences(SerialUploader.java:136)
… 5 more
Caused by: jssc.SerialPortException: Port name - COM9; Method name - openPort(); Exception type - Port busy.
at jssc.SerialPort.openPort(SerialPort.java:164)
at processing.app.Serial.touchForCDCReset(Serial.java:101)
… 6 more