Check structure of folders - Tehnari/oidcfed_lib_php_rp GitHub Wiki

    |
    |-> oidcfed_data
    |   |-> keys
    |
    |->oidcfed_lib_php_rp (web root, cloned from github)
    |   |-> here is source code from github.

Folders oidcfed_data and oidcfed_data/keys should be created at first start/access of the project. But if you see some questions from web server or acl problems just create them manually.