An abstract class error prevent me to access the /administrator page

[hackermade]

Greetings, i set up a new Joomla site and i used kickstarter.php from akeeba to restore a .jpa backup file everything worked perfectly and the frontend looks like before but a strange error don't allow me to login in to the administrator page shows the following error...

Screenshot 2024-05-05 at 22.12.18.png

[Per Yngve Berg]

Was the folder empty before you restored with Kickstart?

[hackermade]

which folder?

[hackermade]

This may help

Joomla! Instance :: Joomla! 5.0.3-Stable (Kuboresha) 20-February-2024
Joomla! Configured :: Yes | Writable (644) |
Configuration Options :: Offline: false | SEF: true | SEF Suffix: false | SEF ReWrite: true | .htaccess/web.config: Yes | GZip: true | Cache: true | CacheTime: 15 | CacheHandler: file | CachePlatformPrefix: false | FTP Layer: N/A | Proxy: false | LiveSite: | Session lifetime: 15 | Session handler: database | Shared sessions: false | SSL: 2 | Error Reporting: maximum | Site Debug: false | Language Debug: false | Default Access: Public | Unicode Slugs: false | dbConnection Type: mysqli | PHP Supports J! 5.0.3: No | Database Supports J! 5.0.3: Yes | Database Credentials Present: Yes |

Host Configuration :: OS: Linux | OS Version: 6.8.0-31-generic | Technology: aarch64 | Web Server: nginx/1.24.0 | Encoding: gzip, br | System TMP Writable: Yes | Free Disk Space : 32.27 GiB |

PHP Configuration :: Version: 8.3.6 | PHP API: fpm-fcgi | Session Path Writable: Yes | Display Errors: 0 | Error Reporting: 22527 | Log Errors To: | Last Known Error: | Register Globals: | Magic Quotes: | Safe Mode: | Allow url fopen: 1 | Open Base: | Uploads: 1 | Max. Upload Size: 256M | Max. POST Size: 256M | Max. Input Time: 60 | Max. Execution Time: 30 | Memory Limit: 512M

Database Configuration :: Version: 8.0.36-2ubuntu3 (Client:mysqlnd 8.3.6) | Database Size: 5.05 MiB | #of Tables with config prefix:  96 | #of other Tables:  0 | User Privileges : GRANT APPLICATION_PASSWORD_ADMINUser Privileges : AUDIT_ABORT_EXEMPTUser Privileges : AUDIT_ADMINUser Privileges : AUTHENTICATION_POLICY_ADMINUser Privileges : BACKUP_ADMINUser Privileges : BINLOG_ADMINUser Privileges : BINLOG_ENCRYPTION_ADMINUser Privileges : CLONE_ADMINUser Privileges : CONNECTION_ADMINUser Privileges : ENCRYPTION_KEY_ADMINUser Privileges : FIREWALL_EXEMPTUser Privileges : FLUSH_OPTIMIZER_COSTSUser Privileges : FLUSH_STATUSUser Privileges : FLUSH_TABLESUser Privileges : FLUSH_USER_RESOURCESUser Privileges : GROUP_REPLICATION_ADMINUser Privileges : GROUP_REPLICATION_STREAMUser Privileges : INNODB_REDO_LOG_ARCHIVEUser Privileges : INNODB_REDO_LOG_ENABLEUser Privileges : PASSWORDLESS_USER_ADMINUser Privileges : PERSIST_RO_VARIABLES_ADMINUser Privileges : REPLICATION_APPLIERUser Privileges : REPLICATION_SLAVE_ADMINUser Privileges : RESOURCE_GROUP_ADMINUser Privileges : RESOURCE_GROUP_USERUser Privileges : ROLE_ADMINUser Privileges : SENSITIVE_VARIABLES_OBSERVERUser Privileges : SERVICE_CONNECTION_ADMINUser Privileges : SESSION_VARIABLES_ADMINUser Privileges : SET_USER_IDUser Privileges : SHOW_ROUTINEUser Privileges : SYSTEM_USERUser Privileges : SYSTEM_VARIABLES_ADMINUser Privileges : TABLE_ENCRYPTION_ADMINUser Privileges : TELEMETRY_LOG_ADMINUser Privileges : XA_RECOVER_ADMIN ON *.* TO `ab`@`localhost`

PHP Extensions :: Core (8.3.6) | date (8.3.6) | libxml (8.3.6) | openssl (8.3.6) | pcre (8.3.6) | zlib (8.3.6) | filter (8.3.6) | hash (8.3.6) | json (8.3.6) | random (8.3.6) | Reflection (8.3.6) | SPL (8.3.6) | session (8.3.6) | standard (8.3.6) | sodium (8.3.6) | cgi-fcgi (8.3.6) | mysqlnd (mysqlnd 8.3.6) | PDO (8.3.6) | xml (8.3.6) | bcmath (8.3.6) | calendar (8.3.6) | ctype (8.3.6) | curl (8.3.6) | dom (20031129) | mbstring (8.3.6) | FFI (8.3.6) | fileinfo (8.3.6) | ftp (8.3.6) | gd (8.3.6) | gettext (8.3.6) | gmp (8.3.6) | iconv (8.3.6) | intl (8.3.6) | exif (8.3.6) | mysqli (8.3.6) | pdo_mysql (8.3.6) | Phar (8.3.6) | posix (8.3.6) | readline (8.3.6) | shmop (8.3.6) | SimpleXML (8.3.6) | sockets (8.3.6) | sysvmsg (8.3.6) | sysvsem (8.3.6) | sysvshm (8.3.6) | tokenizer (8.3.6) | xmlreader (8.3.6) | xmlwriter (8.3.6) | xsl (8.3.6) | zip (1.22.3) | Zend OPcache (8.3.6) | Zend Engine (4.3.6) |
Potential Missing Extensions ::

Switch User Environment :: PHP CGI: Yes | Server SU: No | PHP SU: Yes | Potential Ownership Issues: Maybe

Core Folders :: images/ (755) | components/ (755) | modules/ (755) | plugins/ (755) | language/ (755) | templates/ (755) | cache/ (755) | logs/ (---) | tmp/ (755) | administrator/components/ (755) | administrator/modules/ (755) | administrator/language/ (755) | administrator/templates/ (755) | administrator/logs/ (755) | api/ (755) |

Elevated Permissions (First 10) ::

Database statistics :: Uptime: 2369 | Threads: 2 | Questions: 3767 | Slow queries: 0 | Opens: 807 | Flush tables: 3 | Open tables: 726 | Queries per second avg: 1.590 |

Components :: Site ::
Core ::
3rd Party::

Components :: Admin ::
Core :: com_checkin (4.0.0) 1 | com_admin (4.0.0) 1 | com_actionlogs (3.9.0) 1 | com_cache (4.0.0) 1 | com_mails (4.0.0) 1 | com_joomlaupdate (4.0.3) 1 | com_finder (4.0.0) 0 | com_tags (4.0.0) 0 | com_config (4.0.0) 1 | com_workflow (4.0.0) 1 | com_privacy (3.9.0) 1 | com_plugins (4.0.0) 1 | com_menus (4.0.0) 1 | com_guidedtours (4.3.0) 1 | com_media (3.0.0) 1 | com_newsfeeds (4.0.0) 0 | com_fields (4.0.0) 1 | com_associations (4.0.0) 1 | com_installer (4.0.0) 1 | com_modules (4.0.0) 1 | com_contenthistory (4.0.0) 1 | com_content (4.0.0) 1 | com_postinstall (4.0.0) 1 | com_wrapper (4.0.0) 1 | com_banners (4.0.0) 1 | com_cpanel (4.0.0) 1 | com_templates (4.0.0) 1 | com_messages (4.0.0) 1 | com_users (4.0.0) 1 | com_categories (4.0.0) 1 | com_scheduler (4.1.0) 1 | com_login (4.0.0) 1 | com_ajax (4.0.0) 1 | com_languages (4.0.0) 1 | com_redirect (4.0.0) 1 |
3rd Party:: com_admintools (7.4.9) 1 | com_akeebabackup (9.9.0) 1 |

Modules :: Site ::
Core :: mod_articles_news (3.0.0) 1 | mod_tags_similar (3.1.0) 1 | mod_custom (3.0.0) 1 | mod_stats (3.0.0) 1 | mod_languages (3.5.0) 1 | mod_articles_archive (3.0.0) 1 | mod_breadcrumbs (3.0.0) 1 | mod_finder (3.0.0) 1 | mod_banners (3.0.0) 1 | mod_related_items (3.0.0) 1 | mod_syndicate (3.0.0) 1 | mod_articles_latest (3.0.0) 1 | mod_tags_popular (3.1.0) 1 | mod_users_latest (3.0.0) 1 | mod_articles_popular (3.0.0) 1 | mod_articles_categories (3.0.0) 1 | mod_feed (3.0.0) 1 | mod_random_image (3.0.0) 1 | mod_login (3.0.0) 1 | mod_articles_category (3.0.0) 1 | mod_footer (3.0.0) 1 | mod_wrapper (3.0.0) 1 | mod_whosonline (3.0.0) 1 | mod_menu (3.0.0) 1 |
3rd Party:: mod_jacontentlisting (1.2.6) 1 |

Modules :: Admin ::
Core :: mod_title (3.0.0) 1 | mod_quickicon (3.0.0) 1 | mod_guidedtours (4.3.0) 1 | mod_toolbar (3.0.0) 1 | mod_custom (3.0.0) 1 | mod_user (4.0.0) 1 | mod_stats_admin (3.0.0) 1 | mod_popular (3.0.0) 1 | mod_frontend (4.0.0) 1 | mod_privacy_status (4.0.0) 1 | mod_latest (3.0.0) 1 | mod_messages (4.0.0) 1 | mod_feed (3.0.0) 1 | mod_logged (3.0.0) 1 | mod_loginsupport (4.0.0) 1 | mod_multilangstatus (3.0.0) 1 | mod_login (3.0.0) 1 | mod_post_installation_messages (4.0.0) 1 | mod_version (3.0.0) 1 | mod_submenu (3.0.0) 1 | mod_sampledata (3.8.0) 1 | mod_latestactions (3.9.0) 1 | mod_menu (3.0.0) 1 | mod_privacy_dashboard (3.9.0) 1 |
3rd Party::

Libraries ::
Core ::
3rd Party::

Plugins ::
Core :: plg_installer_webinstaller (4.0.0) 1 | plg_installer_packageinstaller (3.6.0) 1 | plg_installer_urlinstaller (3.6.0) 1 | plg_installer_folderinstaller (3.6.0) 1 | plg_installer_override (4.0.0) 1 | plg_filesystem_local (4.0.0) 1 | plg_workflow_featuring (4.0.0) 1 | plg_workflow_notification (4.0.0) 1 | plg_workflow_publishing (4.0.0) 1 | plg_quickicon_eos (4.4.0) 1 | plg_quickicon_phpversioncheck (3.7.0) 1 | plg_quickicon_extensionupdate (3.0.0) 1 | plg_quickicon_overridecheck (4.0.0) 1 | plg_quickicon_downloadkey (4.0.0) 1 | plg_quickicon_joomlaupdate (3.0.0) 1 | plg_quickicon_privacycheck (3.9.0) 1 | plg_media-action_rotate (4.0.0) 1 | plg_media-action_crop (4.0.0) 1 | plg_media-action_resize (4.0.0) 1 | plg_editors-xtd_image (3.0.0) 1 | plg_editors-xtd_menu (3.7.0) 1 | plg_editors-xtd_fields (3.7.0) 1 | plg_editors-xtd_readmore (3.0.0) 1 | plg_editors-xtd_module (3.5.0) 1 | plg_editors-xtd_article (3.0.0) 1 | plg_editors-xtd_pagebreak (3.0.0) 1 | plg_fields_editor (3.7.0) 1 | plg_fields_radio (3.7.0) 1 | plg_fields_url (3.7.0) 1 | plg_fields_media (3.7.0) 1 | plg_fields_list (3.7.0) 1 | plg_fields_calendar (3.7.0) 1 | plg_fields_integer (3.7.0) 1 | plg_fields_checkboxes (3.7.0) 1 | plg_fields_user (3.7.0) 1 | plg_fields_subform (4.0.0) 1 | plg_fields_usergrouplist (3.7.0) 1 | plg_fields_textarea (3.7.0) 1 | plg_fields_text (3.7.0) 1 | plg_fields_color (3.7.0) 1 | plg_fields_sql (3.7.0) 1 | plg_fields_imagelist (3.7.0) 1 | plg_actionlog_joomla (3.9.0) 1 | plg_multifactorauth_yubikey (3.2.0) 1 | plg_multifactorauth_totp (3.2.0) 1 | plg_multifactorauth_webauthn (4.2.0) 1 | plg_multifactorauth_email (4.2.0) 1 | plg_multifactorauth_fixed (4.2.0) 0 | plg_webservices_installer (4.0.0) 1 | plg_webservices_users (4.0.0) 1 | plg_webservices_redirect (4.0.0) 1 | plg_webservices_media (4.1.0) 1 | plg_webservices_newsfeeds (4.0.0) 1 | plg_webservices_messages (4.0.0) 1 | plg_webservices_banners (4.0.0) 1 | plg_webservices_templates (4.0.0) 1 | plg_webservices_modules (4.0.0) 1 | plg_webservices_config (4.0.0) 1 | plg_webservices_plugins (4.0.0) 1 | plg_webservices_menus (4.0.0) 1 | plg_webservices_languages (4.0.0) 1 | plg_webservices_content (4.0.0) 1 | plg_webservices_privacy (4.0.0) 1 | plg_webservices_tags (4.0.0) 1 | plg_authentication_ldap (3.0.0) 0 | plg_authentication_cookie (3.0.0) 1 | plg_authentication_joomla (3.0.0) 1 | plg_schemaorg_person (5.0.0) 1 | plg_schemaorg_event (5.0.0) 1 | plg_schemaorg_jobposting (5.0.0) 1 | plg_schemaorg_recipe (5.0.0) 1 | plg_schemaorg_book (5.0.0) 1 | plg_schemaorg_blogposting (5.0.0) 1 | plg_schemaorg_custom (5.1.0) ? | plg_schemaorg_article (5.1.0) ? | plg_schemaorg_organization (5.0.0) 1 | plg_api-authentication_basic (4.0.0) 0 | plg_api-authentication_token (4.0.0) 1 | plg_extension_finder (4.0.0) 1 | plg_extension_namespacemap (4.0.0) 1 | plg_extension_joomla (3.0.0) 1 | plg_system_sef (3.0.0) 1 | plg_system_remember (3.0.0) 1 | plg_system_redirect (3.0.0) 1 | plg_system_shortcut (4.2.0) 1 | plg_system_task_notification (4.1) 1 | plg_system_languagefilter (3.0.0) 0 | plg_system_fields (3.7.0) 1 | plg_system_log (3.0.0) 1 | plg_system_webauthn (4.0.0) 1 | plg_system_schedulerunner (4.1) 1 | plg_system_httpheaders (4.0.0) 1 | plg_system_highlight (3.0.0) 1 | plg_system_schemaorg (5.0.0) 1 | plg_system_languagecode (3.0.0) 0 | plg_system_logout (3.0.0) 1 | plg_system_accessibility (4.0.0) 0 | plg_system_skipto (4.0.0) 1 | plg_system_jooa11y (4.2.0) 1 | plg_system_guidedtours (4.3.0) 1 | plg_system_stats (3.5.0) 1 | plg_system_cache (3.0.0) 0 | plg_system_debug (3.0.0) 1 | plg_system_privacyconsent (3.9.0) 0 | plg_system_actionlogs (3.9.0) 1 | plg_finder_contacts (3.0.0) 1 | plg_finder_newsfeeds (3.0.0) 1 | plg_finder_categories (3.0.0) 1 | plg_finder_content (3.0.0) 1 | plg_finder_tags (3.0.0) 1 | plg_user_contactcreator (3.0.0) 0 | plg_user_profile (3.0.0) 0 | plg_user_terms (3.9.0) 0 | plg_user_token (3.9.0) 1 | plg_user_joomla (3.0.0) 1 | plg_content_loadmodule (3.0.0) 1 | plg_content_pagenavigation (3.0.0) 1 | plg_content_confirmconsent (3.9.0) 0 | plg_content_emailcloak (3.0.0) 1 | plg_content_fields (3.7.0) 1 | plg_content_vote (3.0.0) 0 | plg_content_finder (3.0.0) 1 | plg_content_pagebreak (3.0.0) 1 | plg_content_joomla (3.0.0) 1 | plg_task_rotatelogs (5.0.0) 1 | plg_task_requests (4.1) 1 | plg_task_deleteactionlogs (5.0.0) 1 | plg_task_globalcheckin (5.0.0) 1 | plg_task_check_files (4.1) 1 | plg_task_site_status (4.1) 1 | plg_task_updatenotification (5.0.0) 1 | plg_task_sessiongc (5.0.0) 1 | plg_task_privacyconsent (5.0.0) 1 | plg_privacy_message (3.9.0) 1 | plg_privacy_consents (3.9.0) 1 | plg_privacy_user (3.9.0) 1 | plg_privacy_content (3.9.0) 1 | plg_privacy_actionlogs (3.9.0) 1 | plg_sampledata_multilang (4.0.0) 1 | plg_behaviour_compat (5.0.0) 1 | plg_behaviour_versionable (4.0.0) 1 | plg_behaviour_taggable (4.0.0) 1 |
3rd Party:: PLG_QUICKICON_AKEEBABACKUP (9.9.0) 1 | plg_editors_tinymce (6.7.3) 1 | plg_editors_codemirror (6.0.0) 1 | PLG_ACTIONLOG_ADMINTOOLS (7.4.9) 0 | Ajax - JA Content Type (1.2.1) 1 | plg_system_t4 (2.3.9) 1 | System - JA Content Type (1.2.4) 1 | PLG_SYSTEM_ADMINTOOLS (7.4.9) 1 | JA Demo Installer System Plugin (1.2.0) 0 |

Templates :: Site :: ja_blockk (2.1.1) 1 | cassiopeia (1.0) 1 |
Templates :: Admin :: atum (1.0) 1 |

[toivo]

which folder?

The folder where you uploaded the .jpa file and the Kickstart script.

[hackermade]

I use an Ubuntu VPS and i uploaded it in the root of the Joomla installation

Here...but when i ran it was deleted automatically and caused the issue with the admin page

Screenshot 2024-05-06 at 01.32.10.png

[toivo]

Was the folder empty before you restored with Kickstart?

Per was asking whether the main Joomla folder was empty before you uploaded the .jpa file and Kickstart.

If you simply uploaded the two files into the main Joomla folder without emptying it first, errors like this will inevitably occur. The database schema needs to be new, too.

[hackermade]

How can i empty an entire Joomla installation structure? Sorry but i don't get it... Where i should upload the 2 files?

[toivo]

Have you tried to delete the file administrator/cache/autoload_psr.php to see if that helps? That file contains a list of all the classes and it is recreated automatically.

Deleting all the folders and files from the main Joomla folder before the restore operation prevents inconsistencies in the filesystem, if the Joomla versions were different.

Here is a recent example of the same error:
Error when logging into the control panel after restore