undefined method `eq' for nil:NilClass

Hi,
Please help in this regard
I got the error when tried to apply the script for sql command "SELECT * FROM clients WHERE ([clients.id](http://clients.id) = 10)"


Taxa = Model Name

I used
“taxa = Taxa.find(40)” in ActiveRecord::Base… I got the trace as

undefined method `eq' for nil:NilClass

activesupport (3.0.0) lib/active_support/whiny_nil.rb:48:in `method_missing’

activerecord (3.0.0) lib/active_record/relation/finder_methods.rb:291:in `find_one'
activerecord (3.0.0) lib/active_record/relation/finder_methods.rb:281:in `find_with_ids'
activerecord (3.0.0) lib/active_record/relation/finder_methods.rb:107:in `find'

activerecord (3.0.0) lib/active_record/base.rb:439:in `find'
app/models/taxa.rb:2:in `<class:Taxa>'
app/models/taxa.rb:1:in `<top (required)>'
activesupport (3.0.0) lib/active_support/dependencies.rb:454:in `load'

activesupport (3.0.0) lib/active_support/dependencies.rb:454:in `block in load_file'
activesupport (3.0.0) lib/active_support/dependencies.rb:591:in `new_constants_in'
activesupport (3.0.0) lib/active_support/dependencies.rb:453:in `load_file'

activesupport (3.0.0) lib/active_support/dependencies.rb:340:in `require_or_load'
activesupport (3.0.0) lib/active_support/dependencies.rb:491:in `load_missing_constant'
activesupport (3.0.0) lib/active_support/dependencies.rb:183:in `block in const_missing'

activesupport (3.0.0) lib/active_support/dependencies.rb:181:in `each'
activesupport (3.0.0) lib/active_support/dependencies.rb:181:in `const_missing'
activesupport (3.0.0) lib/active_support/dependencies.rb:503:in `load_missing_constant'

activesupport (3.0.0) lib/active_support/dependencies.rb:183:in `block in const_missing'
activesupport (3.0.0) lib/active_support/dependencies.rb:181:in `each'
activesupport (3.0.0) lib/active_support/dependencies.rb:181:in `const_missing'

app/controllers/taxas_controller.rb:5:in `index'
actionpack (3.0.0) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.0.0) lib/abstract_controller/base.rb:150:in `process_action'

actionpack (3.0.0) lib/action_controller/metal/rendering.rb:11:in `process_action'
actionpack (3.0.0) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.0.0) lib/active_support/callbacks.rb:435:in `_run__2427101748358611573__process_action__3945483506732757257__callbacks'

activesupport (3.0.0) lib/active_support/callbacks.rb:409:in `_run_process_action_callbacks'
activesupport (3.0.0) lib/active_support/callbacks.rb:93:in `run_callbacks'
actionpack (3.0.0) lib/abstract_controller/callbacks.rb:17:in `process_action'

actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.0.0) lib/active_support/notifications.rb:52:in `block in instrument'
activesupport (3.0.0) lib/active_support/notifications/instrumenter.rb:21:in `instrument'

activesupport (3.0.0) lib/active_support/notifications.rb:52:in `instrument'
actionpack (3.0.0) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.0.0) lib/action_controller/metal/rescue.rb:17:in `process_action'

actionpack (3.0.0) lib/abstract_controller/base.rb:119:in `process'
actionpack (3.0.0) lib/abstract_controller/rendering.rb:40:in `process'
actionpack (3.0.0) lib/action_controller/metal.rb:133:in `dispatch'

actionpack (3.0.0) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.0.0) lib/action_controller/metal.rb:173:in `block in action'
actionpack (3.0.0) lib/action_dispatch/routing/route_set.rb:62:in `call'

actionpack (3.0.0) lib/action_dispatch/routing/route_set.rb:62:in `dispatch'
actionpack (3.0.0) lib/action_dispatch/routing/route_set.rb:27:in `call'
rack-mount (0.6.13) lib/rack/mount/route_set.rb:148:in `block in call'

rack-mount (0.6.13) lib/rack/mount/code_generation.rb:93:in `block in recognize'
rack-mount (0.6.13) lib/rack/mount/code_generation.rb:68:in `optimized_each'
rack-mount (0.6.13) lib/rack/mount/code_generation.rb:92:in `recognize'

rack-mount (0.6.13) lib/rack/mount/route_set.rb:139:in `call'
actionpack (3.0.0) lib/action_dispatch/routing/route_set.rb:492:in `call'
actionpack (3.0.0) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'

actionpack (3.0.0) lib/action_dispatch/middleware/head.rb:14:in `call'
rack (1.2.1) lib/rack/methodoverride.rb:24:in `call'
actionpack (3.0.0) lib/action_dispatch/middleware/params_parser.rb:21:in `call'

actionpack (3.0.0) lib/action_dispatch/middleware/flash.rb:182:in `call'
actionpack (3.0.0) lib/action_dispatch/middleware/session/abstract_store.rb:149:in `call'
actionpack (3.0.0) lib/action_dispatch/middleware/cookies.rb:287:in `call'

activerecord (3.0.0) lib/active_record/query_cache.rb:32:in `block in call'
activerecord (3.0.0) lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache'
activerecord (3.0.0) lib/active_record/query_cache.rb:12:in `cache'

activerecord (3.0.0) lib/active_record/query_cache.rb:31:in `call'
activerecord (3.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in `call'
actionpack (3.0.0) lib/action_dispatch/middleware/callbacks.rb:46:in `block in call'

activesupport (3.0.0) lib/active_support/callbacks.rb:415:in `_run_call_callbacks'
actionpack (3.0.0) lib/action_dispatch/middleware/callbacks.rb:44:in `call'
rack (1.2.1) lib/rack/sendfile.rb:107:in `call'

actionpack (3.0.0) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
actionpack (3.0.0) lib/action_dispatch/middleware/show_exceptions.rb:46:in `call'
railties (3.0.0) lib/rails/rack/logger.rb:13:in `call'

rack (1.2.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.0.0) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.2.1) lib/rack/lock.rb:11:in `block in call'
<internal:prelude>:10:in `synchronize'

rack (1.2.1) lib/rack/lock.rb:11:in `call'
actionpack (3.0.0) lib/action_dispatch/middleware/static.rb:30:in `call'
railties (3.0.0) lib/rails/application.rb:168:in `call'
railties (3.0.0) lib/rails/application.rb:77:in `method_missing'

railties (3.0.0) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.2.1) lib/rack/content_length.rb:13:in `call'
rack (1.2.1) lib/rack/handler/webrick.rb:52:in `service'
/usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'

/usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
/usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'