ruby on rails - TypeError: can't dump MatchData -

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i've inherited app developer , have added error notification service, , have received 1,408 occurrences of error having trouble getting bottom of...

the error simply:

typeerror: can't dump matchdata

with non-project frames in stack trace....

i can see error occurring in activesupport gem message_verifier.rb file, assume there's error in application or configuration causing originally, , not sure best approach how trace point of origin on our end. strikes me kind of thing may @ , see recognize it. , advice appreciated....

this stack trace:

file "xxx/shared/bundle/ruby/1.9.1/gems/activesupport-3.2.22.2/lib/active_support/message_verifier.rb" line 53 in dump file "xxx/shared/bundle/ruby/1.9.1/gems/activesupport-3.2.22.2/lib/active_support/message_verifier.rb" line 53 in generate file "xxx/shared/bundle/ruby/1.9.1/gems/actionpack-3.2.22.2/lib/action_dispatch/middleware/cookies.rb" line 300 in []= file "xxx/shared/bundle/ruby/1.9.1/gems/actionpack-3.2.22.2/lib/action_dispatch/middleware/session/cookie_store.rb" line 64 in set_cookie file "xxx/shared/bundle/ruby/1.9.1/gems/rack-1.4.7/lib/rack/session/abstract/id.rb" line 335 in commit_session file "xxx/shared/bundle/ruby/1.9.1/gems/rack-1.4.7/lib/rack/session/abstract/id.rb" line 211 in context file "xxx/shared/bundle/ruby/1.9.1/gems/rack-1.4.7/lib/rack/session/abstract/id.rb" line 205 in call file "xxx/shared/bundle/ruby/1.9.1/gems/actionpack-3.2.22.2/lib/action_dispatch/middleware/cookies.rb" line 341 in call file "xxx/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.22.2/lib/active_record/query_cache.rb" line 64 in call file "xxx/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.22.2/lib/active_record/connection_adapters/abstract/connection_pool.rb" line 479 in call file "xxx/shared/bundle/ruby/1.9.1/gems/actionpack-3.2.22.2/lib/action_dispatch/middleware/callbacks.rb" line 28 in block in call file "xxx/shared/bundle/ruby/1.9.1/gems/activesupport-3.2.22.2/lib/active_support/callbacks.rb" line 405 in _run__656928281__call__438689938__callbacks file "xxx/shared/bundle/ruby/1.9.1/gems/activesupport-3.2.22.2/lib/active_support/callbacks.rb" line 405 in __run_callback file "xxx/shared/bundle/ruby/1.9.1/gems/activesupport-3.2.22.2/lib/active_support/callbacks.rb" line 385 in _run_call_callbacks file "xxx/shared/bundle/ruby/1.9.1/gems/activesupport-3.2.22.2/lib/active_support/callbacks.rb" line 81 in run_callbacks file "xxx/shared/bundle/ruby/1.9.1/gems/actionpack-3.2.22.2/lib/action_dispatch/middleware/callbacks.rb" line 27 in call file "xxx/shared/bundle/ruby/1.9.1/gems/actionpack-3.2.22.2/lib/action_dispatch/middleware/remote_ip.rb" line 31 in


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