Error 500 when enabling export functionality of a project

Hi,
I’m running a gitlab instance from a backup (within docker) and I want to move the 2 projects I have on there to a new instance.
I wante to do this via export, and then re-import into new instance.
I then saw that the export function was missing and when I turn on the functionality as an admin, I get the 500 internal server error

here’ the gitlab-ctl tail when the issue arises:

==> /var/log/gitlab/gitlab-rails/production.log <==
Started PATCH "/admin/application_settings/general" for <<redacted internal IP>> at 2022-09-06 19:47:28 +0000
Processing by Admin::ApplicationSettingsController#general as HTML
  Parameters: {"authenticity_token"=>"[FILTERED]", "application_setting"=>{"default_branch_protection"=>"2", "default_project_creation"=>"2", "default_project_visibility"=>"0", "default_snippet_visibility"=>"0", "default_group_visibility"=>"0", "restricted_visibility_levels"=>["", "20"], "import_sources"=>["", "github", "bitbucket", "bitbucket_server", "gitlab", "google_code", "fogbugz", "git", "gitlab_project", "gitea", "manifest", "phabricator"], "project_export_enabled"=>"1", "enabled_git_access_protocol"=>"", "custom_http_clone_url_root"=>"", "rsa_key_restriction"=>"0", "dsa_key_restriction"=>"0", "ecdsa_key_restriction"=>"0", "ed25519_key_restriction"=>"0", "disable_feed_token"=>"[FILTERED]"}}
Completed 500 Internal Server Error in 95ms (ActiveRecord: 68.8ms | Elasticsearch: 0.0ms | Allocations: 28582)

==> /var/log/gitlab/gitlab-rails/production_json.log <==
{"method":"PATCH","path":"/admin/application_settings/general","format":"html","controller":"Admin::ApplicationSettingsController","action":"general","status":500,"time":"2022-09-06T19:47:28.386Z","params":[{"key":"_method","value":"patch"},{"key":"authenticity_token","value":"[FILTERED]"},{"key":"application_setting","value":{"default_branch_protection":"2","default_project_creation":"2","default_project_visibility":"0","default_snippet_visibility":"0","default_group_visibility":"0","restricted_visibility_levels":["","20"],"import_sources":["","github","bitbucket","bitbucket_server","gitlab","google_code","fogbugz","git","gitlab_project","gitea","manifest","phabricator"],"project_export_enabled":"1","enabled_git_access_protocol":"","custom_http_clone_url_root":"","rsa_key_restriction":"0","dsa_key_restriction":"0","ecdsa_key_restriction":"0","ed25519_key_restriction":"0","disable_feed_token":"[FILTERED]"}}],"remote_ip":"<<redacted internal IP>>","user_id":1,"username":"root","ua":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:104.0) Gecko/20100101 Firefox/104.0","correlation_id":"01GCA5FSCNDV2FJ1WEVDDTGNYD","meta.user":"root","meta.caller_id":"Admin::ApplicationSettingsController#general","meta.remote_ip":"<<redacted internal IP>>","meta.feature_category":"not_owned","meta.client_id":"user/1","redis_calls":5,"redis_duration_s":0.001181,"redis_read_bytes":912,"redis_write_bytes":1646,"redis_cache_calls":4,"redis_cache_duration_s":0.000719,"redis_cache_read_bytes":731,"redis_cache_write_bytes":249,"redis_shared_state_calls":1,"redis_shared_state_duration_s":0.000462,"redis_shared_state_read_bytes":181,"redis_shared_state_write_bytes":1397,"db_count":7,"db_write_count":2,"db_cached_count":1,"cpu_s":0.036093,"mem_objects":33374,"mem_bytes":2935006,"mem_mallocs":7594,"mem_total_bytes":4269966,"pid":697,"queue_duration_s":0.013114,"exception.class":"OpenSSL::Cipher::CipherError","exception.message":"","exception.backtrace":["app/services/application_settings/update_service.rb:50:in `update_settings'","app/services/application_settings/update_service.rb:12:in `execute'","app/controllers/admin/application_settings_controller.rb:261:in `perform_update'","app/controllers/admin/application_settings_controller.rb:46:in `block (2 levels) in <class:ApplicationSettingsController>'","app/controllers/application_controller.rb:485:in `set_current_admin'","lib/gitlab/session.rb:11:in `with_session'","app/controllers/application_controller.rb:476:in `set_session_storage'","lib/gitlab/i18n.rb:105:in `with_locale'","lib/gitlab/i18n.rb:111:in `with_user_locale'","app/controllers/application_controller.rb:470:in `set_locale'","app/controllers/application_controller.rb:464:in `set_current_context'","lib/gitlab/metrics/elasticsearch_rack_middleware.rb:16:in `call'","lib/gitlab/middleware/rails_queue_duration.rb:33:in `call'","lib/gitlab/metrics/rack_middleware.rb:16:in `block in call'","lib/gitlab/metrics/web_transaction.rb:21:in `run'","lib/gitlab/metrics/rack_middleware.rb:16:in `call'","lib/gitlab/middleware/speedscope.rb:13:in `call'","lib/gitlab/request_profiler/middleware.rb:17:in `call'","lib/gitlab/jira/middleware.rb:19:in `call'","lib/gitlab/middleware/go.rb:20:in `call'","lib/gitlab/etag_caching/middleware.rb:21:in `call'","lib/gitlab/middleware/multipart.rb:172:in `call'","lib/gitlab/middleware/read_only/controller.rb:50:in `call'","lib/gitlab/middleware/read_only.rb:18:in `call'","lib/gitlab/middleware/same_site_cookies.rb:27:in `call'","lib/gitlab/middleware/handle_malformed_strings.rb:21:in `call'","lib/gitlab/middleware/basic_health_check.rb:25:in `call'","lib/gitlab/middleware/handle_ip_spoof_attack_error.rb:25:in `call'","lib/gitlab/middleware/request_context.rb:21:in `call'","config/initializers/fix_local_cache_middleware.rb:11:in `call'","lib/gitlab/middleware/rack_multipart_tempfile_factory.rb:19:in `call'","lib/gitlab/middleware/sidekiq_web_static.rb:20:in `call'","lib/gitlab/metrics/requests_rack_middleware.rb:74:in `call'","lib/gitlab/middleware/release_env.rb:12:in `call'"],"db_duration_s":0.06881,"view_duration_s":0.0,"duration_s":0.09466}

==> /var/log/gitlab/gitlab-rails/production.log <==

OpenSSL::Cipher::CipherError ():

app/services/application_settings/update_service.rb:50:in `update_settings'
app/services/application_settings/update_service.rb:12:in `execute'
app/controllers/admin/application_settings_controller.rb:261:in `perform_update'
app/controllers/admin/application_settings_controller.rb:46:in `block (2 levels) in <class:ApplicationSettingsController>'
app/controllers/application_controller.rb:485:in `set_current_admin'
lib/gitlab/session.rb:11:in `with_session'
app/controllers/application_controller.rb:476:in `set_session_storage'
lib/gitlab/i18n.rb:105:in `with_locale'
lib/gitlab/i18n.rb:111:in `with_user_locale'
app/controllers/application_controller.rb:470:in `set_locale'
app/controllers/application_controller.rb:464:in `set_current_context'
lib/gitlab/metrics/elasticsearch_rack_middleware.rb:16:in `call'
lib/gitlab/middleware/rails_queue_duration.rb:33:in `call'
lib/gitlab/metrics/rack_middleware.rb:16:in `block in call'
lib/gitlab/metrics/web_transaction.rb:21:in `run'
lib/gitlab/metrics/rack_middleware.rb:16:in `call'
lib/gitlab/middleware/speedscope.rb:13:in `call'
lib/gitlab/request_profiler/middleware.rb:17:in `call'
lib/gitlab/jira/middleware.rb:19:in `call'
lib/gitlab/middleware/go.rb:20:in `call'
lib/gitlab/etag_caching/middleware.rb:21:in `call'
lib/gitlab/middleware/multipart.rb:172:in `call'
lib/gitlab/middleware/read_only/controller.rb:50:in `call'
lib/gitlab/middleware/read_only.rb:18:in `call'
lib/gitlab/middleware/same_site_cookies.rb:27:in `call'
lib/gitlab/middleware/handle_malformed_strings.rb:21:in `call'
lib/gitlab/middleware/basic_health_check.rb:25:in `call'
lib/gitlab/middleware/handle_ip_spoof_attack_error.rb:25:in `call'
lib/gitlab/middleware/request_context.rb:21:in `call'
config/initializers/fix_local_cache_middleware.rb:11:in `call'
lib/gitlab/middleware/rack_multipart_tempfile_factory.rb:19:in `call'
lib/gitlab/middleware/sidekiq_web_static.rb:20:in `call'
lib/gitlab/metrics/requests_rack_middleware.rb:74:in `call'
lib/gitlab/middleware/release_env.rb:12:in `call'

==> /var/log/gitlab/gitlab-workhorse/current <==
{"content_type":"text/html; charset=utf-8","correlation_id":"01GCA5FSCNDV2FJ1WEVDDTGNYD","duration_ms":111,"host":"<<redacted internal IP>>","level":"info","method":"POST","msg":"access","proto":"HTTP/1.1","referrer":"<<redacted internal IP>>/admin/application_settings/general","remote_addr":"127.0.0.1:0","remote_ip":"127.0.0.1","route":"","status":500,"system":"http","time":"2022-09-06T19:47:28Z","ttfb_ms":111,"uri":"/admin/application_settings/general","user_agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:104.0) Gecko/20100101 Firefox/104.0","written_bytes":2926}

==> /var/log/gitlab/nginx/gitlab_access.log <==
192.168.0.14 - - [06/Sep/2022:19:47:28 +0000] "POST /admin/application_settings/general HTTP/1.1" 500 2926 "http://<<redacted internal IP>>/admin/application_settings/general" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:104.0) Gecko/20100101 Firefox/104.0" -

gitlab-rake gitlab:check --trace returns all OK and YES

From the upper error trace, I gather that there’s a problem with OpenSSL::Cipher::CipherError () ?
I tried to fix this error with the solution shown here (GitLab error OpenSSL::Cipher::CipherError () in app/controllers/admin/application_settings_controller.rb:40:in `update' · GitHub) but that made my system inaccessible (error: gotlab is taking too long to respond - container unhealthy)

I have now restored the initital bakcup again and I’mwondering how to fix this issue.

Is there any other way I can backup a project to move to anew gitlab instance?

Is there a setting that I can manually change and then restart gitlab?