# Pipeline number of arguments error **URL:** \ **Category:** Logstash\ **Created:** [February 16, 2022, 12:09pm UTC](https://discuss.elastic.co/t/pipeline-number-of-arguments-error/297367 "2022-02-16T12:09:53Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Michael\_Bailey](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/michael_bailey/32/99390_2.png) [@Michael\_Bailey](https://discuss.elastic.co/u/Michael_Bailey)\ **Post date:** [February 16, 2022, 12:09pm UTC](https://discuss.elastic.co/t/pipeline-number-of-arguments-error/297367/1 "2022-02-16T12:09:53Z")
Hi, For some reason I have started to get the following fatal error with logstash 8.0.0. ```auto [LogStash::Runner] runner - An unexpected error occurred! {:error=>#, :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/api/modules/base.rb:43:in `initialize'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/sinatra-2.2.0/lib/sinatra/base.rb:1537:in `new'", "/usr/share/logstash/logstash-core/lib/logstash/api/rack_app.rb:113:in `block in app'", "org/jruby/RubyBasicObject.java:2622:in `instance_eval'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/rack-2.2.3/lib/rack/builder.rb:125:in `initialize'", "/usr/share/logstash/logstash-core/lib/logstash/api/rack_app.rb:101:in `app'", "/usr/share/logstash/logstash-core/lib/logstash/webserver.rb:123:in `initialize'", "/usr/share/logstash/logstash-core/lib/logstash/webserver.rb:74:in `from_settings'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:69:in `initialize'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:508:in `create_agent'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:399:in `execute'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/clamp-1.0.1/lib/clamp/command.rb:68:in `run'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:282:in `run'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/clamp-1.0.1/lib/clamp/command.rb:133:in `run'", "/usr/share/logstash/lib/bootstrap/environment.rb:93:in `
'"]} [FATAL] 2022-02-16 12:00:07.550 [LogStash::Runner] runner - An unexpected error occurred! {:error=>#, :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/api/modules/base.rb:43:in `initialize'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/sinatra-2.2.0/lib/sinatra/base.rb:1537:in `new'", "/usr/share/logstash/logstash-core/lib/logstash/api/rack_app.rb:113:in `block in app'", "org/jruby/RubyBasicObject.java:2622:in `instance_eval'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/rack-2.2.3/lib/rack/builder.rb:125:in `initialize'", "/usr/share/logstash/logstash-core/lib/logstash/api/rack_app.rb:101:in `app'", "/usr/share/logstash/logstash-core/lib/logstash/webserver.rb:123:in `initialize'", "/usr/share/logstash/logstash-core/lib/logstash/webserver.rb:74:in `from_settings'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:69:in `initialize'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:508:in `create_agent'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:399:in `execute'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/clamp-1.0.1/lib/clamp/command.rb:68:in `run'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:282:in `run'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/clamp-1.0.1/lib/clamp/command.rb:133:in `run'", "/usr/share/logstash/lib/bootstrap/environment.rb:93:in `
'"]} ``` I have no idea how to go about debugging what the issue is. I have simplified my config (see below) but am still getting the error. ```auto input { s3 { access_key_id => "${AWS_ACCESS_KEY}" secret_access_key => "${AWS_SECRET}" bucket => "${S3_BUCKET}" prefix => "${S3_PATH}" region => "${S3_REGION}" watch_for_new_files => false } } output { stdout{} } ``` Any help would be appreciated. ---
**Author:** ![sbillo](https://avatars.discourse-cdn.com/v4/letter/s/a3d4f5/32.png) [@sbillo](https://discuss.elastic.co/u/sbillo)\ **Post date:** [February 16, 2022, 3:15pm UTC](https://discuss.elastic.co/t/pipeline-number-of-arguments-error/297367/2 "2022-02-16T15:15:24Z")
When I install the logstash-output-http version 5.2.5 plugin (/usr/share/logstash/bin/logstash-plugin install logstash-output-http) the logstash-mixin-http\_client dependency is downloaded which updates Sinatra from the version 2.1.0 to 2.2.0. Logstash with this library crashes with this error: An unexpected error occurred! {: error =\> # \ Analyzing sinatra 2.2.0 ("/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/sinatra-2.2.0/lib/sinatra/base.rb) line 1537 it can be seen that the \*\* kwargs parameter in addiction compared to version 2.1.0 def new (\* args, \*\* kwargs, & bk) instance = new! (\* args, \*\* kwargs, & bk) Wrapper.new (build (instance) .to\_app, instance) For the moment I managed to solve the problem by installing the http plugin with the --preserve option which DOES NOT automatically update the logstash-mixin-http\_client dependency and therefore keeps Sinatra at version 2.1.0 /usr/share/logstash/bin/logstash-plugin install --preserve logstash-output-http But it is not correct for a plugin update to break logstash ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [February 16, 2022, 6:53pm UTC](https://discuss.elastic.co/t/pipeline-number-of-arguments-error/297367/3 "2022-02-16T18:53:18Z")
A [fix](https://github.com/elastic/logstash/pull/13784) for this was committed about 4 hours ago. I would expect it to be in 8.0.1. ---
**Author:** ![Michael\_Bailey](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/michael_bailey/32/99390_2.png) [@Michael\_Bailey](https://discuss.elastic.co/u/Michael_Bailey)\ **Post date:** [February 16, 2022, 8:22pm UTC](https://discuss.elastic.co/t/pipeline-number-of-arguments-error/297367/4 "2022-02-16T20:22:03Z")
Thankyou all, yes I was installing an output plugin which must have been causing this. I will pull 8.0.1 when available. Cheers ---
**Author:** ![RDIUS](https://avatars.discourse-cdn.com/v4/letter/r/ec9cab/32.png) [@RDIUS](https://discuss.elastic.co/u/RDIUS)\ **Post date:** [February 24, 2022, 10:13am UTC](https://discuss.elastic.co/t/pipeline-number-of-arguments-error/297367/5 "2022-02-24T10:13:14Z")
Hello, @Michael_Bailey @sbillo, Another solution is to downgrade the version of Logstash. In my case, the current logstash version was 7.17, so i downgrade it to 7.15 ```auto sudo apt-get install logstash=1:7.15.0-1 ``` Hope it helps! ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [March 24, 2022, 10:13am UTC](https://discuss.elastic.co/t/pipeline-number-of-arguments-error/297367/6 "2022-03-24T10:13:33Z")
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