Windows 10 Permission Error 13

[hf81-ble]

I ran into issues with the demo Sample on a lawicel CANUSB Dongle.

using slcan with COM10 on windows.

Testcase looks like

*** Settings ***
Resource      CURF/keywords/curf.robot
Test Setup      Set CAN Bus ${INTERFACE} ${CHANNEL} ${BITRATE} ${DB FILE} 
Test Teardown   End Log Can 
Library    DateTime

*** Variables ***
${DB FILE}              None
${INTERFACE}            slcan
${CHANNEL}              COM10
${BITRATE}              500000
${DEFAULT TIMEOUT}      3
${DEFAULT NODE}         DRIVER


*** Test Cases ***
Log Next Raw Frame
    ${Next_Frame} =     Get Next Raw Can Frame
    Log       ${Next_Frame}

The Output is:

robot can.robot

==============================================================================
Can
==============================================================================
Log Next Raw Frame                                                    | FAIL |
Setup failed:
SerialException: could not open port 'COM10': PermissionError(13, 'Zugriff verweigert', None, 5)

Also teardown failed:
AttributeError: 'Curf' object has no attribute 'notifier'

If i use the python-can directly, i have no issues to send a message over can:

import can
can.rc['interface'] = 'slcan'
can.rc['channel'] = 'COM10'
can.rc['bitrate'] = 500000
from can.interface import Bus

bus = can.interface.Bus(bustype="slcan", channel="COM10") 

tx_msg = can.Message(
    arbitration_id=0x01,
    data=[0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88],
 )
bus.send(tx_msg)

print("Stopped sending messages")

I looks like this is not a general problem on sending can messages from windows with the device.