Homegear with Max! does not work

Hi. I had installed homegear and want to use flashed max! cube with it.

When I try to start homegear it can not connect to max! cube.
I get this error. Maybe someone know what problem can be?

10/10/21 07:40:34.240 Module MAX: CUL "My-MAX-CUL": Couldn't open CUL device "/dev/ttyACM0": Permission denied
10/10/21 07:40:34.241 Info: Could not set thread priority. The executing user does not have enough privileges. Please run "ulimit -r 100" before executing Homegear.