# Getting Rack::MiniProfiler:Class (NoMethodError)

**URL:** <https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89>\
**Category:** Ruby\
**Created:** [July 27, 2012, 2:05pm UTC](https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89 "2012-07-27T14:05:53Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![christian](https://sea2.discourse-cdn.com/flex016/user_avatar/community.miniprofiler.com/christian/32/454_2.png) [@christian](https://community.miniprofiler.com/u/christian)\
**Post date:** [July 27, 2012, 2:05pm UTC](https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89/1 "2012-07-27T14:05:53Z")

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I get

/Users/Chris/.rvm/gems/ruby-1.9.2-p290/gems/rack-mini-profiler-0.1.7/lib/mini\_profiler/storage/file\_store.rb:43:in `block in initialize': undefined method`instance’ for Rack::MiniProfiler:Class (NoMethodError)

When starting our rails server via: thin start

I notice if I remove the Mongo gem in our gemfile, the error goes away.

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**Author:** ![christian](https://sea2.discourse-cdn.com/flex016/user_avatar/community.miniprofiler.com/christian/32/454_2.png) [@christian](https://community.miniprofiler.com/u/christian)\
**Post date:** [July 27, 2012, 2:08pm UTC](https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89/2 "2012-07-27T14:08:27Z")

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In the gemfile in Rails:

gem ‘mongo’

Run bundle and then thin start

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**Author:** ![sam](https://sea2.discourse-cdn.com/flex016/user_avatar/community.miniprofiler.com/sam/32/377_2.png) [@sam](https://community.miniprofiler.com/u/sam)\
**Post date:** [July 27, 2012, 2:27pm UTC](https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89/3 "2012-07-27T14:27:42Z")

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seeing a few related mongo reports, would you mind including your full Gemfile and Gemfile.lock?

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**Author:** ![sam](https://sea2.discourse-cdn.com/flex016/user_avatar/community.miniprofiler.com/sam/32/377_2.png) [@sam](https://community.miniprofiler.com/u/sam)\
**Post date:** [July 28, 2012, 3:54am UTC](https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89/4 "2012-07-28T03:54:18Z")

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got a fix pushed to github will do another release on monday

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**Author:** ![sam](https://sea2.discourse-cdn.com/flex016/user_avatar/community.miniprofiler.com/sam/32/377_2.png) [@sam](https://community.miniprofiler.com/u/sam)\
**Post date:** [July 29, 2012, 10:14pm UTC](https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89/5 "2012-07-29T22:14:47Z")

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should be fixed in latest, please confirm

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**Author:** ![christian](https://sea2.discourse-cdn.com/flex016/user_avatar/community.miniprofiler.com/christian/32/454_2.png) [@christian](https://community.miniprofiler.com/u/christian)\
**Post date:** [August 10, 2012, 9:28am UTC](https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89/6 "2012-08-10T09:28:04Z")

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Confirmed! Seems to work now. Thanks for the update.

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**Author:** ![hlegius](https://sea2.discourse-cdn.com/flex016/user_avatar/community.miniprofiler.com/hlegius/32/449_2.png) [@hlegius](https://community.miniprofiler.com/u/hlegius)\
**Post date:** [August 20, 2012, 3:10am UTC](https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89/7 "2012-08-20T03:10:14Z")

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works for me too!  
Thanks!

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**Author:** ![sam](https://sea2.discourse-cdn.com/flex016/user_avatar/community.miniprofiler.com/sam/32/377_2.png) [@sam](https://community.miniprofiler.com/u/sam)\
**Post date:** [December 2, 2013, 11:39pm UTC](https://community.miniprofiler.com/t/getting-rack-miniprofiler-class-nomethoderror/89/8 "2013-12-02T23:39:26Z")

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