ruby on rails - will_paginate can't convert Fixnum into Hash error -

everything pretty simple:
makes me crazy (

controller:

@p = product.paginate(:page => 1, :per_page => 10) 

view:

<%= will_paginate @p %> 

error:

showing d:/sites/stockox/app/views/catalog/index.html.erb line #1 raised: can't convert fixnum hash extracted source (around line #1): 1: <%= will_paginate @p %> 

trace:

ctionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:589:in `merge!' actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:589:in `url_for' actionpack (3.2.9) lib/action_dispatch/routing/url_for.rb:148:in `url_for' actionpack (3.2.9) lib/action_view/helpers/url_helper.rb:107:in `url_for' will_paginate (3.0.4) lib/will_paginate/view_helpers/action_view.rb:115:in `url' will_paginate (3.0.4) lib/will_paginate/view_helpers/link_renderer.rb:93:in `link' will_paginate (3.0.4) lib/will_paginate/view_helpers/link_renderer.rb:45:in `page_number' will_paginate (3.0.4) lib/will_paginate/view_helpers/link_renderer.rb:28:in `block in to_html' will_paginate (3.0.4) lib/will_paginate/view_helpers/link_renderer.rb:26:in `map' will_paginate (3.0.4) lib/will_paginate/view_helpers/link_renderer.rb:26:in `to_html' will_paginate (3.0.4) lib/will_paginate/view_helpers.rb:94:in `will_paginate' will_paginate (3.0.4) lib/will_paginate/view_helpers/action_view.rb:33:in `will_paginate' app/views/catalog/index.html.erb:1:in `_app_views_catalog_index_html_erb__739715019_37374852' actionpack (3.2.9) lib/action_view/template.rb:145:in `block in render' activesupport (3.2.9) lib/active_support/notifications.rb:125:in `instrument' actionpack (3.2.9) lib/action_view/template.rb:143:in `render' actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:47:in `block (2 levels) in render_template' actionpack (3.2.9) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument' activesupport (3.2.9) lib/active_support/notifications.rb:123:in `block in instrument' activesupport (3.2.9) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (3.2.9) lib/active_support/notifications.rb:123:in `instrument' actionpack (3.2.9) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument' actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:46:in `block in render_template' actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:54:in `render_with_layout' actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:45:in `render_template' actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:18:in `render' actionpack (3.2.9) lib/action_view/renderer/renderer.rb:36:in `render_template' actionpack (3.2.9) lib/action_view/renderer/renderer.rb:17:in `render' actionpack (3.2.9) lib/abstract_controller/rendering.rb:110:in `_render_template' actionpack (3.2.9) lib/action_controller/metal/streaming.rb:225:in `_render_template' actionpack (3.2.9) lib/abstract_controller/rendering.rb:103:in `render_to_body' actionpack (3.2.9) lib/action_controller/metal/renderers.rb:28:in `render_to_body' actionpack (3.2.9) lib/action_controller/metal/compatibility.rb:50:in `render_to_body' actionpack (3.2.9) lib/abstract_controller/rendering.rb:88:in `render' actionpack (3.2.9) lib/action_controller/metal/rendering.rb:16:in `render' actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render' activesupport (3.2.9) lib/active_support/core_ext/benchmark.rb:5:in `block in ms' c:/ruby/ruby193/lib/ruby/1.9.1/benchmark.rb:295:in `realtime' activesupport (3.2.9) lib/active_support/core_ext/benchmark.rb:5:in `ms' actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:40:in `block in render' actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime' activerecord (3.2.9) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime' actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:39:in `render' remotipart (1.0.5) lib/remotipart/render_overrides.rb:14:in `render_with_remotipart' actionpack (3.2.9) lib/action_controller/metal/implicit_render.rb:10:in `default_render' actionpack (3.2.9) lib/action_controller/metal/implicit_render.rb:5:in `send_action' actionpack (3.2.9) lib/abstract_controller/base.rb:167:in `process_action' actionpack (3.2.9) lib/action_controller/metal/rendering.rb:10:in `process_action' actionpack (3.2.9) lib/abstract_controller/callbacks.rb:18:in `block in process_action' activesupport (3.2.9) lib/active_support/callbacks.rb:436:in `_run__717039044__process_action__667298987__callbacks' activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback' activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (3.2.9) lib/abstract_controller/callbacks.rb:17:in `process_action' actionpack (3.2.9) lib/action_controller/metal/rescue.rb:29:in `process_action' actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' activesupport (3.2.9) lib/active_support/notifications.rb:123:in `block in instrument' activesupport (3.2.9) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (3.2.9) lib/active_support/notifications.rb:123:in `instrument' actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:29:in `process_action' actionpack (3.2.9) lib/action_controller/metal/params_wrapper.rb:207:in `process_action' activerecord (3.2.9) lib/active_record/railties/controller_runtime.rb:18:in `process_action' actionpack (3.2.9) lib/abstract_controller/base.rb:121:in `process' actionpack (3.2.9) lib/abstract_controller/rendering.rb:45:in `process' actionpack (3.2.9) lib/action_controller/metal.rb:203:in `dispatch' actionpack (3.2.9) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' actionpack (3.2.9) lib/action_controller/metal.rb:246:in `block in action' actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:73:in `call' actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:36:in `call' journey (1.0.4) lib/journey/router.rb:68:in `block in call' journey (1.0.4) lib/journey/router.rb:56:in `each' journey (1.0.4) lib/journey/router.rb:56:in `call' actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:601:in `call' rack-pjax (0.7.0) lib/rack/pjax.rb:12:in `call' warden (1.2.1) lib/warden/manager.rb:35:in `block in call' warden (1.2.1) lib/warden/manager.rb:34:in `catch' warden (1.2.1) lib/warden/manager.rb:34:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' rack (1.4.5) lib/rack/etag.rb:23:in `call' rack (1.4.5) lib/rack/conditionalget.rb:25:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/head.rb:14:in `call' remotipart (1.0.5) lib/remotipart/middleware.rb:30:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/params_parser.rb:21:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/flash.rb:242:in `call' rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context' rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/cookies.rb:341:in `call' activerecord (3.2.9) lib/active_record/query_cache.rb:64:in `call' activerecord (3.2.9) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `_run__405498685__call__41785573__callbacks' activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback' activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/reloader.rb:65:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' railties (3.2.9) lib/rails/rack/logger.rb:32:in `call_app' railties (3.2.9) lib/rails/rack/logger.rb:16:in `block in call' activesupport (3.2.9) lib/active_support/tagged_logging.rb:22:in `tagged' railties (3.2.9) lib/rails/rack/logger.rb:16:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/request_id.rb:22:in `call' rack (1.4.5) lib/rack/methodoverride.rb:21:in `call' rack (1.4.5) lib/rack/runtime.rb:17:in `call' activesupport (3.2.9) lib/active_support/cache/strategy/local_cache.rb:72:in `call' rack (1.4.5) lib/rack/lock.rb:15:in `call' actionpack (3.2.9) lib/action_dispatch/middleware/static.rb:62:in `call' railties (3.2.9) lib/rails/engine.rb:479:in `call' railties (3.2.9) lib/rails/application.rb:223:in `call' rack (1.4.5) lib/rack/content_length.rb:14:in `call' railties (3.2.9) lib/rails/rack/log_tailer.rb:17:in `call' thin (1.4.1) lib/thin/connection.rb:80:in `block in pre_process' thin (1.4.1) lib/thin/connection.rb:78:in `catch' thin (1.4.1) lib/thin/connection.rb:78:in `pre_process' thin (1.4.1) lib/thin/connection.rb:53:in `process' thin (1.4.1) lib/thin/connection.rb:38:in `receive_data' eventmachine-1.0.0.rc.4-x86 (mingw32) lib/eventmachine.rb:187:in `run_machine' eventmachine-1.0.0.rc.4-x86 (mingw32) lib/eventmachine.rb:187:in `run' thin (1.4.1) lib/thin/backends/base.rb:63:in `start' thin (1.4.1) lib/thin/server.rb:159:in `start' rack (1.4.5) lib/rack/handler/thin.rb:13:in `run' rack (1.4.5) lib/rack/server.rb:268:in `start' railties (3.2.9) lib/rails/commands/server.rb:70:in `start' railties (3.2.9) lib/rails/commands.rb:55:in `block in <top (required)>' railties (3.2.9) lib/rails/commands.rb:50:in `tap' railties (3.2.9) lib/rails/commands.rb:50:in `<top (required)>' script/rails:6:in `require' script/rails:6:in `<main>'