abrt-cli reports "is not a problem directory"

we are try to remove all folders from /var/spool/abrt/ on rhel 7.2 machines and that after we stop the services abrt-ccpp.service and abrtd.service because we not want any more the core under spool but we get find /var/spool/abrt/ -type d -exec abrt-cli rm '{}' \; '/var/spool/abrt' is not a problem directory Can't delete '/var/spool/abrt/': (null) '/var/spool/abrt/ccpp-2019-11-20-12:13:41-64941' is not a problem directory Can't delete '/var/spool/abrt/ccpp-2019-11-20-12:13:41-64941': (null) '/var/spool/abrt/ccpp-2019-11-20-12:16:12-2687' is not a problem directory Can't delete '/var/spool/abrt/ccpp-2019-11-20-12:16:12-2687': (null) '/var/spool/abrt/ccpp-2019-11-20-14:20:09-61612' is not a problem directory Can't delete '/var/spool/abrt/ccpp-2019-11-20-14:20:09-61612': (null) '/var/spool/abrt/ccpp-2019-11-20-15:12:03-55822' is not a problem directory Can't delete '/var/spool/abrt/ccpp-2019-11-20-15:12:03-55822': (null) the folder under spool are drwx------ 2 root root 4096 Dec 16 11:54 ccpp-2019-11-20-18:43:24-8768 drwx------ 2 root root 4096 Dec 16 11:54 ccpp-2019-11-20-12:14:55-1014 drwx------ 2 root root 4096 Dec 16 11:54 ccpp-2019-11-20-12:21:34-8475 drwx------ 2 root root 4096 Dec 16 11:54 ccpp-2019-11-20-12:25:27-12740 drwx------ 2 root root 4096 Dec 16 11:54 ccpp-2019-11-20-12:32:28-19585 drwx------ 2 root root 4096 Dec 16 11:54 ccpp-2019-11-20-16:13:48-52746 any solution for this problem? we also try find /var/spool/abrt/ -mindepth 1 -type d -exec abrt-cli rm '{}' \; '/var/spool/abrt/ccpp-2019-11-20-12:13:41-64941' is not a problem directory Can't delete '/var/spool/abrt/ccpp-2019-11-20-12:13:41-64941': (null) '/var/spool/abrt/ccpp-2019-11-20-12:16:12-2687' is not a problem directory Can't delete '/var/spool/abrt/ccpp-2019-11-20-12:16:12-2687': (null) '/var/spool/abrt/ccpp-2019-11-20-14:20:09-61612' is not a problem directory Can't delete '/var/spool/abrt/ccpp-2019-11-20-14:20:09-61612': (null) '/var/spool/abrt/ccpp-2019-11-20-15:12:03-55822' is not a problem directory Can't delete '/var/spool/abrt/ccpp-2019-11-20-15:12:03-55822': (null) and we can see that we get the folder as find /var/spool/abrt/ -mindepth 1 -type d -print |more /var/spool/abrt/ccpp-2019-11-20-12:13:41-64941 /var/spool/abrt/ccpp-2019-11-20-12:16:12-2687 /var/spool/abrt/ccpp-2019-11-20-14:20:09-61612 /var/spool/abrt/ccpp-2019-11-20-15:12:03-55822 /var/spool/abrt/ccpp-2019-11-20-18:37:25-2253 /var/spool/abrt/ccpp-2019-11-20-12:22:50-9886 /var/spool/abrt/ccpp-2019-11-20-13:01:41-46329 /var/spool/abrt/ccpp-2019-11-20-13:20:12-582 /var/spool/abrt/ccpp-2019-11-20-14:07:40-48870 /var/spool/abrt/ccpp-2019-11-20-15:15:23-59287 /var/spool/abrt/ccpp-2019-11-20-19:35:27-61003 /var/spool/abrt/ccpp-2019-11-20-11:22:29-12490 /var/spool/abrt/ccpp-2019-11-20-14:44:22-26098 /var/spool/abrt/ccpp-2019-11-20-17:57:35-24985