Web application could not be started

An error occurred while starting up the preloader. It exited before signalling successful startup back to Phusion Passenger. Please read this article for more information about this problem.

Raw process output:

*** ERROR ***: Cannot execute /opt/rh/rh-passenger40/root/usr/libexec/passenger-ruby22: No such file or directory (2)
Error ID
ca39d4bf
Application root
/srv/acs_virtualhosting/eas/staging.eas.caltech.edu/current
Environment (value of RAILS_ENV, RACK_ENV, WSGI_ENV, NODE_ENV and PASSENGER_APP_ENV)
staging
Ruby interpreter command
/opt/rh/rh-passenger40/root/usr/libexec/passenger-ruby22
User and groups
uid=16090(rails4) gid=16090(rails4) groups=16090(rails4) context=system_u:system_r:passenger_t:s0
Environment variables
MANPATH=/opt/rh/rh-passenger40/root/usr/share/man:/opt/rh/rh-ror50/root/usr/share/man:/opt/rh/rh-ruby24/root/usr/local/share/man:/opt/rh/rh-ruby24/root/usr/share/man:/opt/rh/httpd24/root/usr/share/man:
HOSTNAME=v-eas-web18.eas.caltech.edu
SHELL=/bin/bash
HISTSIZE=1000
LIBRARY_PATH=/opt/rh/httpd24/root/usr/lib64
PASSENGER_DEBUG_DIR=/tmp/passenger.spawn-debug.XXXXxlBxl0
X_SCLS=rh-passenger40 rh-ror50 rh-ruby24  httpd24
USER=rails4
LD_LIBRARY_PATH=/opt/rh/rh-passenger40/root/usr/lib64:/opt/rh/rh-ror50/root/usr/lib64:/opt/rh/rh-ruby24/root/usr/local/lib64:/opt/rh/rh-ruby24/root/usr/lib64:/opt/rh/httpd24/root/usr/lib64
MAIL=/var/spool/mail/rails4
PATH=/opt/rh/rh-passenger40/root/usr/bin:/opt/rh/rh-passenger40/root/usr/sbin:/opt/rh/rh-ror50/root/usr/bin:/opt/rh/rh-ruby24/root/usr/local/bin:/opt/rh/rh-ruby24/root/usr/bin:/opt/rh/httpd24/root/usr/bin:/opt/rh/httpd24/root/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/home/rails4/bin
PWD=/srv/acs_virtualhosting/eas/staging.eas.caltech.edu/current
LANG=C
NOTIFY_SOCKET=/run/systemd/notify
HISTCONTROL=ignoredups
HOME=/home/rails4
SHLVL=0
LOGNAME=rails4
GEM_PATH=/opt/rh/rh-ror50/root/usr/share/gems:/home/rails4/.gem/ruby:/opt/rh/rh-ruby24/root/usr/share/gems:/opt/rh/rh-ruby24/root/usr/local/share/gems
XDG_DATA_DIRS=/opt/rh/rh-ruby24/root/usr/local/share:/opt/rh/rh-ruby24/root/usr/share:/usr/local/share:/usr/share
LESSOPEN=||/usr/bin/lesspipe.sh %s
PKG_CONFIG_PATH=/opt/rh/rh-passenger40/root/usr/lib64/pkgconfig:/opt/rh/rh-ror50/root/usr/lib64/pkgconfig:/opt/rh/rh-ruby24/root/usr/local/lib64/pkgconfig:/opt/rh/rh-ruby24/root/usr/lib64/pkgconfig:/opt/rh/httpd24/root/usr/lib64/pkgconfig
IN_PASSENGER=1
PYTHONUNBUFFERED=1
NODE_PATH=/opt/rh/rh-passenger40/root/usr/share/passenger/node
RAILS_ENV=staging
RACK_ENV=staging
WSGI_ENV=staging
NODE_ENV=staging
PASSENGER_APP_ENV=staging
UNIQUE_ID=XMnjDFF-78tTJucTm25JxAAAAAA
SERVER_PROTOCOL=HTTP/1.1
SERVER_SOFTWARE=Apache/2.4.34 (Red Hat) OpenSSL/1.0.2k-fips Phusion_Passenger/4.0.50
DOCUMENT_ROOT=/srv/acs_virtualhosting/eas/staging.eas.caltech.edu/current/public
SERVER_ADMIN=root@localhost
QUERY_STRING=
SERVER_NAME=staging.eas.caltech.edu
REMOTE_PORT=44158
REMOTE_ADDR=192.168.71.26
SERVER_PORT=80
REQUEST_METHOD=GET
SERVER_ADDR=192.168.71.26
REQUEST_URI=/
Ulimits
Unknown
System metrics
------------- General -------------
Kernel version    : 3.10.0-957.el7.x86_64
Uptime            : 16d 0h 50m 43s
Load averages     : 0.75%, 0.34%, 0.16%
Fork rate         : unknown

------------- CPU -------------
Number of CPUs    :    4
Average CPU usage :   0%  --   0% user,   0% nice,   0% system, 100% idle
  CPU 1           :   0%  --   0% user,   0% nice,   0% system, 100% idle
  CPU 2           :   0%  --   0% user,   0% nice,   0% system, 100% idle
  CPU 3           :   0%  --   0% user,   0% nice,   0% system, 100% idle
  CPU 4           :   0%  --   0% user,   0% nice,   0% system, 100% idle
I/O pressure      :   0%
  CPU 1           :   0%
  CPU 2           :   0%
  CPU 3           :   0%
  CPU 4           :   0%
Interference from other VMs:   0%
  CPU 1                    :   0%
  CPU 2                    :   0%
  CPU 3                    :   0%
  CPU 4                    :   0%

------------- Memory -------------
RAM total         :  16037 MB
RAM used          :   2588 MB (16%)
RAM free          :  13449 MB
Swap total        :   1639 MB
Swap used         :      0 MB (0%)
Swap free         :   1639 MB
Swap in           : unknown
Swap out          : unknown