failed to write on serial port

[StefanT83]

Hi,

I am not able to lauch the script. As soon as I type in:
$ roslaunch razor_imu_m0_driver driver_node.launch
I get this error:
[ERROR] [1579016157.552088447]: Failed to write to SparkFun 9DoF Razor IMU M0 serial port. Attempted to write 1 bytes, actually wrote 0 bytes.
[ERROR] [1579016157.553422628]: SparkFun 9DoF Razor IMU M0 failed to configure IMU. Will retry in five seconds.

I did check inside the script driver_node.launch and set the variable "port" to "/dev/imu0" which is correct. I'm running Ubuntu 16.04.6 wirh ROS kinetic.
Any ideas?