Radius authentication issue

GVM versions

gsad: Greenbone Security Assistant 21.4.1~dev1
gvmd: Greenbone Vulnerability Manager 21.4.2~git-09bdb532f-HEAD
openvas-scanner: OpenVAS 21.4.1~git-81c6a4e8-HEAD


Operating system: Ubuntu 20.04
Kernel: 5.4.0-84-generic #94-Ubuntu
Installation method / source: source

hi all

when i try radius authentication i get the following in the log

radius_init: Couldn’t read temp radius config file /tmp/gvm_radius_conf_dZwQTX

any ideas?