# Script/server error on Mac OS X **URL:** \ **Category:** Rails\ **Created:** [March 26, 2009, 5:52pm UTC](https://www.ruby-forum.com/t/script-server-error-on-mac-os-x/163989 "2009-03-26T17:52:52Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![bernardub](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/96bed5/32.png) [@bernardub](https://www.ruby-forum.com/u/bernardub)\ **Post date:** [March 26, 2009, 5:52pm UTC](https://www.ruby-forum.com/t/script-server-error-on-mac-os-x/163989/1 "2009-03-26T17:52:52Z")
Hello all, Recently, my apps stopped functionning properly on my dev machine running Mac OS 10.4.11 Both script/server and script/console commands return this : dub-macbook:~/Sites/contacts dub$ script/server dyld: NSLinkModule() error dyld: Symbol not found: \_rb\_thread\_alive\_p Referenced from: /Users/dub/.gem/ruby/1.8/gems/fastthread-1.0.5/lib/ fastthread.bundle Expected in: flat namespace Trace/BPT trap dub-macbook:~/Sites/contacts dub$ script/server dyld: NSLinkModule() error dyld: Symbol not found: \_rb\_thread\_alive\_p Referenced from: /Users/dub/.gem/ruby/1.8/gems/fastthread-1.0.5/lib/ fastthread.bundle Expected in: flat namespace ## Trace/BPT trap The apps were working properly before I proceeded to update some gems including capistrano and mongrel. This affects apps in development that run the latest versions of rails (2.2.2), although I have an old app running 1.1.6 and it works fine. I could not find this type of error documented anywhere, does anyone have a clue? Things I tried : check if a new fresh app renders the same error (it does) reinstalling ruby 1.8.6 (still the same error) reinstalling gems (error still there) updating mongrel, fastthread, rails (idem) Thanks in advance for any advice or clue as to what’s going on! Bernard D. ---
**Author:** ![bernardub](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/96bed5/32.png) [@bernardub](https://www.ruby-forum.com/u/bernardub)\ **Post date:** [March 26, 2009, 5:54pm UTC](https://www.ruby-forum.com/t/script-server-error-on-mac-os-x/163989/2 "2009-03-26T17:54:02Z")
the same thing has happened to me. Anyone know a solution? On Mar 26, 11:24 am, Bernard D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![bernardub](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/96bed5/32.png) [@bernardub](https://www.ruby-forum.com/u/bernardub)\ **Post date:** [March 26, 2009, 11:08pm UTC](https://www.ruby-forum.com/t/script-server-error-on-mac-os-x/163989/3 "2009-03-26T23:08:27Z")
For some reason, I tried uninstalling fastthread 1.0.5 with the command gem uninstall fastthread -v 1.0.5 as explained here : [http://railsforum.com/viewtopic.php?pid=91777](http://railsforum.com/viewtopic.php?pid=91777) It didnt work for me, for some reason fastthread 1.0.5 was still listed as installed while performing gem -list Bu then I removed all fastthread versions by hand with rm -dr fastthread\* in the proper directory, then reinstalled fastthread 1.0.4. script/server was still broken, but script/server webrick worked (after hitting ctrl-c, strangely). I’m aware this is just a dirty workaround, not sure everything is in proper working order. I think I’ll just install passenger and forget about mongrel, unless anyone comes with a clean solution? On Mar 26, 5:53 pm, “removed\_email\_address@domain.invalid” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![bernardub](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/96bed5/32.png) [@bernardub](https://www.ruby-forum.com/u/bernardub)\ **Post date:** [March 28, 2009, 7:32pm UTC](https://www.ruby-forum.com/t/script-server-error-on-mac-os-x/163989/4 "2009-03-28T19:32:25Z")
Same problem here, fastthread 1.0.4 are 1.0.5 are broken or otherwise incompatible with the latest update - SOLUTION: uninstall fastthread 1.0.4 and explicitly install fastthread 1.0.1 here is partial log of my session Hoover-iMac:/var/www/cook amateur\_peasant$ mongrel\_rails start -d dyld: NSLinkModule() error dyld: Symbol not found: \_rb\_thread\_alive\_p Referenced from: /usr/local/lib/ruby/gems/1.8/gems/fastthread-1.0.4/lib/fastthread.bundle Expected in: flat namespace Trace/BPT trap Hoover-iMac:/usr/local amateur\_peasant$ sudo gem uninstall fastthread Password: You have requested to uninstall the gem: fastthread-1.0.4 mongrel-1.1.5 depends on [fastthread (\>= 1.0.1)] If you remove this gems, one or more dependencies will not be met. Continue with Uninstall? [Yn] y Successfully uninstalled fastthread-1.0.4 Hoover-iMac:/usr/local amateur\_peasant$ sudo gem install fastthread -v 1.0.1 THEN I CAN START mongrel Hoover-iMac:/var/www/cook amateur\_peasant$ mongrel\_rails start -d Hoover-iMac:/var/www/cook amateur\_peasant$ versions: Mac OS X 10.4.11 ruby 1.8.6 (2007-03-13 patchlevel 0) [i686-darwin8.11.1] gem 1.3.1 rake 0.8.4 mysql-5.1.32