Rail６｜謎のエラー文章の解除　or　理解したいです。

前提・実現したいこと

Railsでアプリを作っています。
いたる所に下記のようなエラーメッセージが発生し、今のところ支障がないのですが（気づいていないだけかもですが）、可能であれば解消したいと思っています。

発生している問題・エラーメッセージ

rails sやrails routesなどを入力するたびに、
謎のエラー文の長文。（今のところ問題ないが、やや不気味）

エラーメッセージ

該当のソースコード

ソースコード
MASAKI@●masakinoMacBook-Pro Sample % rails s
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_AIO_LISTIO_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_AIO_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_AIO_PRIO_DELTA_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_ARG_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_ATEXIT_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_BC_BASE_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_BC_DIM_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_BC_SCALE_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_BC_STRING_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_CHILD_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_CLK_TCK
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_COLL_WEIGHTS_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_DELAYTIMER_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_EXPR_NEST_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_HOST_NAME_MAX

<<中略>>

/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_CHAR_TERM
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_FORT_DEV
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_FORT_RUN
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_LOCALEDEF
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_PBS
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_PBS_ACCOUNTING
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_PBS_CHECKPOINT
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_PBS_LOCATE
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_PBS_MESSAGE
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_PBS_TRACK
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_SW_DEV
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_UPE
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_2_VERSION
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_PAGE_SIZE
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_PAGESIZE
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_THREAD_DESTRUCTOR_ITERATIONS
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_THREAD_KEYS_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_THREAD_STACK_MIN
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_THREAD_THREADS_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_RE_DUP_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_RTSIG_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_SEM_NSEMS_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_SEM_VALUE_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_SIGQUEUE_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_STREAM_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_SYMLOOP_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_TIMER_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_TTY_NAME_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_TZNAME_MAX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_XOPEN_CRYPT
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_XOPEN_ENH_I18N
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_XOPEN_REALTIME
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_XOPEN_REALTIME_THREADS
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_XOPEN_SHM
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_XOPEN_STREAMS
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_XOPEN_UNIX
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_XOPEN_VERSION
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_PHYS_PAGES
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_NPROCESSORS_CONF
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::SC_NPROCESSORS_ONLN
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::CS_PATH
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::CS_POSIX_V6_ILP32_OFF32_CFLAGS
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::CS_POSIX_V6_ILP32_OFF32_LDFLAGS
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::CS_POSIX_V6_ILP32_OFF32_LIBS

<<中略>>


/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::PC_ASYNC_IO
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::PC_PRIO_IO
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Etc::PC_SYNC_IO
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Struct::Passwd
/Users/MASAKI/.rbenv/versions/2.6.5/lib/ruby/2.6.0/x86_64-darwin19/etc.bundle: warning: already initialized constant Struct::Group