Problems with plugin in Centos using rpm installer

I installed ocs server in Centos 7 using rpm installers.

Now I can't install plugins. When I try to install any plugin, I always receive this message: ""The communication server encountered the following error on install : Err_02".

I checked help and logs, but nothing works. Plugin directories are created and apache has access, SELinux is disabled, firewall is disabled, both OCSInventory-Reports and OCSInventory-Server are on the same machine.

Don't know what to do.