[SOLVED] docker installation of openproject: Phusion passenger fails to start after installation

I am trying to install openproject using docker on centos7.6 but Phusion passenger fails to start after installation. Error is suggesting it failed to parse response. The preloader process sent an unparseable response:. I don't know how to fix this issue.
stdout:
-----> Database setup finished.
       On first installation, the default admin credentials are login: admin, password: admin
-----> Launching supervisord...
2019-05-08 08:14:46,313 CRIT Supervisor running as root (no user in config file)
2019-05-08 08:14:46,318 INFO supervisord started with pid 1
2019-05-08 08:14:47,321 INFO spawned: 'postgres' with pid 155
2019-05-08 08:14:47,325 INFO spawned: 'apache2' with pid 156
2019-05-08 08:14:47,328 INFO spawned: 'web' with pid 157
2019-05-08 08:14:47,331 INFO spawned: 'worker' with pid 158
2019-05-08 08:14:47,351 INFO spawned: 'postfix' with pid 159
2019-05-08 08:14:47,360 INFO spawned: 'memcached' with pid 160
2019-05-08 08:14:47.634 UTC [172] LOG:  database system was shut down at 2019-05-08 08:14:44 UTC
2019-05-08 08:14:47,634 INFO success: postfix entered RUNNING state, process has stayed up for > than 0 seconds (startsecs)
2019-05-08 08:14:47.649 UTC [172] LOG:  MultiXact member wraparound protections are now enabled
2019-05-08 08:14:47.653 UTC [155] LOG:  database system is ready to accept connections
2019-05-08 08:14:47.663 UTC [177] LOG:  autovacuum launcher started
2019-05-08 08:14:48,670 INFO success: postgres entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2019-05-08 08:14:48,670 INFO success: apache2 entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2019-05-08 08:14:48,670 INFO success: web entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2019-05-08 08:14:48,670 INFO success: worker entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2019-05-08 08:14:48,670 INFO success: memcached entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
2019-05-08 08:14:50,198 INFO exited: postfix (exit status 0; expected)
 --> Downloading a Phusion Passenger agent binary for your platform

 --> Installing Nginx 1.15.8 engine

--------------------------

 [passenger_native_support.so] trying to compile for the current user (app) and Ruby interpreter...
     (set PASSENGER_COMPILE_NATIVE_SUPPORT_BINARY=0 to disable)
     Compilation successful. The logs are here:
     /tmp/passenger_native_support-15tsfhk.log
 [passenger_native_support.so] successfully loaded.
=============== Phusion Passenger Standalone web server started ===============
PID file: /app/tmp/pids/passenger.8080.pid
Log file: /app/log/passenger.8080.log
Environment: production
Accessible via: http://0.0.0.0:8080/

You can stop Phusion Passenger Standalone by pressing Ctrl-C.
Problems? Check https://www.phusionpassenger.com/library/admin/standalone/troubleshooting/
===============================================================================
[ N 2019-05-08 08:15:01.7338 404/Tb age/Cor/SecurityUpdateChecker.h:519 ]: Security update check: no update found (next check in 24 hours)
Forcefully loading the application. Use :environment to avoid eager loading.
[auth_saml] Missing settings from '/app/config/plugins/auth_saml/settings.yml', skipping omniauth registration.
hook registered
App 439 output: [auth_saml] Missing settings from '/app/config/plugins/auth_saml/settings.yml', skipping omniauth registration.
App 439 output: hook registered
Creating scope :order_by_name. Overwriting existing method Sprint.order_by_name.
App 439 output: Creating scope :order_by_name. Overwriting existing method Sprint.order_by_name.
[Worker(host:d0b3748f627a pid:158)] Starting job worker
2019-05-08T08:15:45+0000: [Worker(host:d0b3748f627a pid:158)] Starting job worker
App 439 output: /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/ruby_supportlib/phusion_passenger/preloader_shared_helpers.rb:108:in `fork': Cannot allocate memory - fork(2) (Errno::ENOMEM)
App 439 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/ruby_supportlib/phusion_passenger/preloader_shared_helpers.rb:108:in `handle_spawn_command'
App 439 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/ruby_supportlib/phusion_passenger/preloader_shared_helpers.rb:78:in `accept_and_process_next_client'
App 439 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/ruby_supportlib/phusion_passenger/preloader_shared_helpers.rb:167:in `run_main_loop'
App 439 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/helper-scripts/rack-preloader.rb:207:in `<module:App>'
App 439 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/helper-scripts/rack-preloader.rb:30:in `<module:PhusionPassenger>'
App 439 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/helper-scripts/rack-preloader.rb:29:in `<main>'
[ E 2019-05-08 08:15:46.6971 404/Tc age/Cor/App/Implementation.cpp:221 ]: Could not spawn process for application /app: The preloader process sent an unparseable response: 
  Error ID: d7825364
  Error details saved to: /tmp/passenger-error-wjSTKF.html

[ E 2019-05-08 08:15:46.7028 404/T8 age/Cor/Con/CheckoutSession.cpp:276 ]: [Client 1-1] Cannot checkout session because a spawning error occurred. The identifier of the error is d7825364. Please see earlier logs for details about the error.
[ W 2019-05-08 08:34:24.7967 404/Tk age/Cor/Spa/SmartSpawner.h:572 ]: An error occurred while spawning an application process: Cannot connect to Unix socket '/tmp/passenger.PKROzbY/apps.s/preloader.hyl9g8': No such file or directory (errno=2)
[ W 2019-05-08 08:34:24.7968 404/Tk age/Cor/Spa/SmartSpawner.h:574 ]: The application preloader seems to have crashed, restarting it and trying again...
App 543 output: [auth_saml] Missing settings from '/app/config/plugins/auth_saml/settings.yml', skipping omniauth registration.
App 543 output: hook registered
App 543 output: Creating scope :order_by_name. Overwriting existing method Sprint.order_by_name.
App 543 output: /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/ruby_supportlib/phusion_passenger/preloader_shared_helpers.rb:108:in `fork': Cannot allocate memory - fork(2) (Errno::ENOMEM)
App 543 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/ruby_supportlib/phusion_passenger/preloader_shared_helpers.rb:108:in `handle_spawn_command'
App 543 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/ruby_supportlib/phusion_passenger/preloader_shared_helpers.rb:78:in `accept_and_process_next_client'
App 543 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/ruby_supportlib/phusion_passenger/preloader_shared_helpers.rb:167:in `run_main_loop'
App 543 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/helper-scripts/rack-preloader.rb:207:in `<module:App>'
App 543 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/helper-scripts/rack-preloader.rb:30:in `<module:PhusionPassenger>'
App 543 output:     from /app/vendor/bundle/ruby/2.6.0/gems/passenger-6.0.1/src/helper-scripts/rack-preloader.rb:29:in `<main>'
[ E 2019-05-08 08:34:52.2521 404/Tk age/Cor/App/Implementation.cpp:221 ]: Could not spawn process for application /app: The preloader process sent an unparseable response: 
  Error ID: c2ce0823
  Error details saved to: /tmp/passenger-error-bpsfAC.html

[ E 2019-05-08 08:34:52.2570 404/T8 age/Cor/Con/CheckoutSession.cpp:276 ]: [Client 1-2] Cannot checkout session because a spawning error occurred. The identifier of the error is c2ce0823. Please see earlier logs for details about the error.
Thanks.