Logstash XML Parser Fail - File Does Not Exist?

Elastic Stack Logstash
1

After upgrading logstash to 5.6.5 I am know getting the following error en masse and don't understand what the error is trying to tell me.

Snip of logstash config for xml section:

            xml {
                source => "sub-message"
                store_xml => true
                target => "parsed_xml"
                remove_field => [ "[parsed_xml][Appliance]", "[parsed_xml][Company]", "[parsed_xml][HostName]", "[parsed_xml][Priority]", "[parsed_xml][Version]" ]
                id => "SA-xml-1"
                add_tag => "xml-parse"
            }

Which results in the error below:

[2017-12-12T10:38:15,682][WARN ][logstash.filters.xml     ] Error parsing xml with XmlSimple {:source=>"sub-message", :value=>"SecureAuth14[10436] After sending OTP with: OTPHtmlEmailProvider", :exception=>#<ArgumentError: File does not exist: SecureAuth14[10436] After sending OTP with: OTPHtmlEmailProvider.>, :backtrace=>["/usr/share/logstash/vendor/bundle/jruby/1.9/gems/xml-simple-1.1.5/lib/xmlsimple.rb:996:in `find_xml_file'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/xml-simple-1.1.5/lib/xmlsimple.rb:168:in `xml_in'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/xml-simple-1.1.5/lib/xmlsimple.rb:203:in `xml_in'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-xml-4.0.5/lib/logstash/filters/xml.rb:182:in `filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:145:in `do_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:164:in `multi_filter'", "org/jruby/RubyArray.java:1613:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:161:in `multi_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filter_delegator.rb:46:in `multi_filter'", "(eval):6971:in `initialize'", "org/jruby/RubyArray.java:1613:in `each'", "(eval):6965:in `initialize'", "org/jruby/RubyProc.java:281:in `call'", "(eval):6998:in `initialize'", "org/jruby/RubyArray.java:1613:in `each'", "(eval):6994:in `initialize'", "org/jruby/RubyProc.java:281:in `call'", "(eval):1502:in `filter_func'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:398:in `filter_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:379:in `worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:342:in `start_workers'"]}
2

Not 100% sure of this, but after doing a bit more review, it looks like the log data that was coming in XML switched at a certain point to regular text. So the XML filter basically had nothing to do since the data in the 'sub-message' field was not XML formatted.

ArgumentError: File does not exist I interpret as trying to tell me this in case this helps anyone else out.