Hiera Eyaml Error - Cannot load backend eyaml: no such file to load -- hiera/backend/eyaml_backend

We have installed **hiera-eyaml** rubygem as the root user on the Puppet Master node to encrypt/decrypt our passwords. *# /opt/puppetlabs/bin/puppetserver gem install hiera-eyaml --no-doc --no-ri --verbose* *# /opt/puppetlabs/puppet/bin/gem install hiera-eyaml --no-doc --no-ri --verbose* **eyaml** command seems to work fine on the commandline to encrypt/decrypt passwords and also edit the *.yaml files containing the passwords *# /opt/puppetlabs/puppet/bin/eyaml* Our Hiera file : *:backends:* *- eyaml* *- yaml* *:eyaml:* *:datadir: "/etc/puppetlabs/code/environments/%{environment}/hieradata"* *:pkcs7_private_key: /etc/puppetlabs/puppet/eyaml-keys/%{environment}/%{::zone}/private_key.pkcs7.pem* *:pkcs7_public_key: /etc/puppetlabs/puppet/eyaml-keys/%{environment}/%{::zone}/public_key.pkcs7.pem* *:cache_decrypted: false* *:extension: 'yaml'* *:yaml:* *:datadir: "/etc/puppetlabs/code/environments/%{environment}/hieradata"* *:hierarchy:* *- "environments/%{::environment}/%{::zone}_secure"* - "environments/%{::environment}/%{::zone}" - "environments/%{::environment}/%{::environment}" - "roles/%{::role}" - "common" - "versions/artifact-versions"* Note : zone and role are our external facts We also restarted PuppetMaster and reinstalled hiera-eyaml. We still have the same issue. PuppetMaster is unable to decrypt the passwords during a puppet agent run for us . It produces the following error : **[puppetserver] Puppet Evaluation Error: Error while evaluating a Function Call, Cannot load backend eyaml: no such file to load -- hiera/backend/eyaml_backend at /etc/puppetlabs/code/environments/production/manifests/site.pp:2:10 on node** I have enclosed the below version information that we use : Puppet Version : 4.7.0 pe-puppetserver-2016.4.0.1006 pe-puppet-enterprise-release-2016.4.2.0 puppet-agent-1.7.1 64-bit, RHEL 7.3 (Maipo) *# /opt/puppetlabs/bin/puppetserver gem list --local | grep -E "(eyaml|trollop|highline)" hiera-eyaml (2.1.0)* highline (1.6.21) trollop (2.1.2) *# /opt/puppetlabs/puppet/bin/gem list --local | grep -E "(eyaml|trollop|highline)"* *hiera-eyaml (2.1.0)* *highline (1.6.21)* *trollop (2.1.2)* *# /opt/puppetlabs/puppet/bin/ruby --version* ruby 2.1.9p490 *# /opt/puppetlabs/puppet/bin/gem --version* 2.2.5