# Upgraded to Ruby 1.9.1 and Mongrel now fails

**URL:** <https://www.ruby-forum.com/t/upgraded-to-ruby-1-9-1-and-mongrel-now-fails/184079>\
**Category:** Mongrel\
**Created:** [February 24, 2010, 7:12pm UTC](https://www.ruby-forum.com/t/upgraded-to-ruby-1-9-1-and-mongrel-now-fails/184079 "2010-02-24T19:12:35Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![asno](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/e8c25b/32.png) [@asno](https://www.ruby-forum.com/u/asno)\
**Post date:** [February 24, 2010, 7:12pm UTC](https://www.ruby-forum.com/t/upgraded-to-ruby-1-9-1-and-mongrel-now-fails/184079/1 "2010-02-24T19:12:35Z")

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We recently upgraded to ruby 1.9.1 (in order to get new functions in the  
Math module). We’ve reinstalled Mongrel with it, and even gone so far  
to  
make some modifications to the compile (based on a post I found on one  
of  
the forums).

Mongrel now fails when we try to launch it:  
mongrel\_rails cluster::start

With the message:  
ERROR RUNNING ‘cluster::start’: Plugin /cluster::start does not exist in  
category /commands  
Use help command to get help

Has anyone seen this error? Is there a known fix? I saw a posting from  
a  
couple years ago about need to a:  
Gem cleanup mongrel\_cluster

…but that doesn’t appear to have made any difference.

Any suggestions would be greatly appreciated.

Thanks,

Dave

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<div class="post-metadata">

**Author:** ![asno](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/e8c25b/32.png) [@asno](https://www.ruby-forum.com/u/asno)\
**Post date:** [February 28, 2010, 1:33pm UTC](https://www.ruby-forum.com/t/upgraded-to-ruby-1-9-1-and-mongrel-now-fails/184079/2 "2010-02-28T13:33:12Z")

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On Wed, Feb 24, 2010 at 6:57 PM, Dave W. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> category /commands  
> Use help command to get help
> 
> Has anyone seen this error? Is there a known fix? I saw a posting from a  
> couple years ago about need to a:  
> Gem cleanup mongrel\_cluster

Has you installed mongrel\_cluster gem?

## I’m not aware that mongrel\_cluster is compatible with Ruby 1.9.1

## Luis L. AREA 17

Perfection in design is achieved not when there is nothing more to add,  
but rather when there is nothing more to take away.  
Antoine de Saint-Exupéry