Couldn't decode protobuf

Elastic Stack Logstash
1

After upgrading Logstash 5.6.11 → 6.4.0 when decoding protobuf I get an error:

[WARN ][logstash.codecs.protobuf ] Couldn't decode protobuf: #<ProtocolBuffers::DecodeError: too many bytes when decoding varint>.

Logstash config 
input {
	http {
		id => "AppMon ProtoBuf decode"
		port => 8080
		codec => protobuf {
			class_name => "Export::Bt::BusinessTransactions"
			include_path => ['/usr/share/logstash/lib/pluginmanager/dynatrace.rb']
		}
	}
}

output {
	file {
		path => "/app/logstash/out/test.out"
	}
}
dynatrace.rb 
#!/usr/bin/env ruby
# Generated by the protocol buffer compiler. DO NOT EDIT!

require 'protocol_buffers'

module Export
  module Bt
	# forward declarations
	class BusinessTransactions < ::ProtocolBuffers::Message; end
	class BusinessTransaction < ::ProtocolBuffers::Message; end
	class BtOccurrence < ::ProtocolBuffers::Message; end

	class BusinessTransactions < ::ProtocolBuffers::Message
	  set_fully_qualified_name "export.bt.BusinessTransactions"
	  repeated ::Export::Bt::BusinessTransaction, :businessTransactions, 1
	  optional :int32, :lostTransactions, 2
	  optional :string, :serverName, 3
	end

	class BusinessTransaction < ::ProtocolBuffers::Message
	  # forward declarations

	  # enums
	  module Type
		include ::ProtocolBuffers::Enum

		set_fully_qualified_name "export.bt.BusinessTransaction.Type"

		PUREPATH = 0
		USER_ACTION = 1
		VISIT = 2
	  end

	  set_fully_qualified_name "export.bt.BusinessTransaction"

	  required :string, :name, 1
	  optional ::Export::Bt::BusinessTransaction::Type, :type, 2
	  optional :string, :application, 3
	  repeated :string, :measureNames, 4
	  repeated :string, :dimensionNames, 5
	  repeated ::Export::Bt::BtOccurrence, :occurrences, 6
	  optional :string, :systemProfile, 7
	end

	class BtOccurrence < ::ProtocolBuffers::Message
	  set_fully_qualified_name "export.bt.BtOccurrence"

	  required :int64, :startTime, 1
	  optional :int64, :endTime, 2
	  optional :string, :purePathId, 5
	  repeated :double, :values, 6
	  repeated :string, :dimensions, 7
	  optional :string, :actionName, 8
	  optional :string, :url, 9
	  optional :string, :query, 10
	  optional :int64, :visitId, 11
	  optional :string, :user, 12
	  optional :double, :apdex, 13
	  optional :bool, :converted, 14
	  optional :double, :responseTime, 15
	  optional :double, :cpuTime, 16
	  optional :double, :syncTime, 17
	  optional :double, :waitTime, 18
	  optional :double, :suspensionTime, 19
	  optional :double, :execTime, 20
	  optional :double, :duration, 21
	  optional :bool, :failed, 22
	  optional :int32, :nrOfActions, 23
	  optional :string, :clientFamily, 24
	  optional :string, :clientIP, 25
	  optional :string, :continent, 26
	  optional :string, :country, 27
	  optional :string, :city, 28
	  optional :int32, :failedActions, 29
	  optional :int32, :clientErrors, 30
	  optional :bool, :exitActionFailed, 31
	  optional :bool, :bounce, 32
	  optional :string, :osFamily, 33
	  optional :string, :osName, 34
	  optional :string, :connectionType, 35
	  repeated :string, :convertedBy, 36
	  optional :double, :clientTime, 37
	  optional :double, :networkTime, 38
	  optional :double, :serverTime, 39
	  optional :int32, :urlRedirectionTime, 40
	  optional :int32, :dnsTime, 41
	  optional :int32, :connectTime, 42
	  optional :int32, :sslTime, 43
	  optional :int32, :documentRequestTime, 44
	  optional :int32, :documentResponseTime, 45
	  optional :int32, :processingTime, 46
	end

  end
end

Please tell me how to fix the problem?

2

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