# Ruby script/server error

**URL:** <https://www.ruby-forum.com/t/ruby-script-server-error/163985>\
**Category:** Rails\
**Created:** [March 26, 2009, 5:52pm UTC](https://www.ruby-forum.com/t/ruby-script-server-error/163985 "2009-03-26T17:52:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\
**Post date:** [March 26, 2009, 5:52pm UTC](https://www.ruby-forum.com/t/ruby-script-server-error/163985/1 "2009-03-26T17:52:16Z")

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I updated the ruby gems and now I keep getting this error when trying  
to run: ruby script/server

dyld: NSLinkModule() error  
dyld: Symbol not found: \_rb\_thread\_alive\_p  
Referenced from: /Users/mikejahn/.gem/ruby/1.8/gems/fastthread-1.0.5/  
lib/fastthread.bundle  
Expected in: flat namespace

Trace/BPT trap

any suggestions on how to fix it?