Rake jobs:work error

Hai!

delayed_job (2.0.3) version

I am getting this error: Any one can help me

D:\Bala\ppos\plink>rake jobs:work --trace
(in D:/Bala/ppos/plink)
rake aborted!
Don’t know how to build task ‘jobs:work’
C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1728:in []' C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2050:ininvoke_task’
C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in
top_level' C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:ineach’
C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in
top_level' C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:instandard_excep
tion_handling’
C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in
top_level' C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:inrun’
C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in
standard_excep tion_handling' C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:inrun’
C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
C:/Ruby186/bin/rake:19:in `load’
C:/Ruby186/bin/rake:19

D:\Bala\ppos\plink>

Thanking you:) bdeveloper01