Traceback (most recent call last):
	23: from /usr/bin/fluentd:23:in `<main>'
	22: from /usr/bin/fluentd:23:in `load'
	21: from /usr/lib64/ruby/gems/2.5.0/gems/fluentd-1.9.2/bin/fluentd:8:in `<top (required)>'
	20: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	19: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	18: from /usr/lib64/ruby/gems/2.5.0/gems/fluentd-1.9.2/lib/fluent/command/fluentd.rb:19:in `<top (required)>'
	17: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	16: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	15: from /usr/lib64/ruby/gems/2.5.0/gems/fluentd-1.9.2/lib/fluent/supervisor.rb:20:in `<top (required)>'
	14: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	13: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	12: from /usr/lib64/ruby/gems/2.5.0/gems/fluentd-1.9.2/lib/fluent/config.rb:18:in `<top (required)>'
	11: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	10: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	 9: from /usr/lib64/ruby/gems/2.5.0/gems/fluentd-1.9.2/lib/fluent/config/element.rb:18:in `<top (required)>'
	 8: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	 7: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	 6: from /usr/lib64/ruby/gems/2.5.0/gems/fluentd-1.9.2/lib/fluent/config/literal_parser.rb:20:in `<top (required)>'
	 5: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:39:in `require'
	 4: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
	 3: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `require'
	 2: from /usr/lib64/ruby/gems/2.5.0/gems/yajl-ruby-1.0.0/lib/yajl.rb:1:in `<top (required)>'
	 1: from /usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
/usr/lib64/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require': cannot load such file -- yajl/yajl (LoadError)