Failed to execute action

Hi firends i am getting an error like below but there is no error in the first line of my conf file. Does anyone have an idea ?

Failed to execute action {:action=>LogStash::PipelineAction::Create/pipeline_id:main, :exception=>"LogStash::ConfigurationError", :message=>"Expected one of [ \\t\\r\\n ], \"#\", \"input\", \"filter\", \"output\" at line 1, column 1 (byte 1)", :backtrace=>["C:/logstash-7.10. 1/logstash-core/lib/logstash/compiler.rb:32:in `compile_imperative'", "org/logstash/execution/AbstractPipelineExt.java:184:in `initialize'", "org/logstash/execution/JavaBasePipelineExt. java:69:in `initialize'", "C:/logstash-7.10.1/logstash-core/lib/logstash/java_pipeline.rb:47:in `initialize'", "C:/logstash-7.10.1/ logstash-core/lib/logstash/pipeline_action/create.rb:52:in `execute'", "C:/logstash-7.10.1/logstash-core/lib/logstash/agent.rb:365:in `block in converge_state'"]}

My conf file:

input { 
   file { 
      path => "C:/Users/........./example.csv"
      start_position => "beginning"
      sincedb_path => "NUL" 
   }
}
filter{...}
output{...}

There are many threads in this forum addressing this. Here is one.

@Badger thank you.