nil object Error

hi all,
i am getting following error ,i can’t figure it out why and from where it is coming ?
please help me out to resolved this error if anyone knows about this issue.
i am using following env.

O.S:Windows XP
Ruby:ruby 1.8.7 (2011-02-18 patchlevel 334) [i386-mingw32]
Rails:Rails 2.3.11
Gem:1.6.2

ActionView::TemplateError (You have a nil object when you didn’t expect it! You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]) on line #61 of app/views/layouts/main_bk_layout.rhtml:
58: <%if @session != nil%>
59:


60: <%else%>
61: <%if @session[‘user’].first_name == “admin”%>
62:

63: <%end%>
64: <%end%>

main_bk_layout.rhtml is main rhtml loaded.

thanks in advanced !!!

Regards
Sachin S. Kewale

hi all,
i am getting following error ,i can't figure it out why and from where it
is coming ?

It would help if you had not cropped the top of the error which tells
you _exactly_ which line is causing the error :-/

ActionView::TemplateError (You have a nil object when you didn't expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]) on line #61 of
app/views/layouts/main_bk_layout.rhtml:
58: <%if @session != nil%>
59: <table width="250" border="0" height="20"
align="right" cellspacing="0" cellpadding="0">
60: <%else%>
61: <%if @session['user'].first_name == "admin"%>

At a guess, I'd say you don't have an element in your @session
variable for 'user'; hence the "nil object when you didn't expect it".

But that's just a guess based on the info given...

hi Michael ,
this full trace of the error below.i am new in ROR ,so can you tell me how to set session in ROR?
and if set session is coming null then can set it?

i give you the brief of my project :-
in my project the main rhtml is main_bk_layout.rhtml into which the one user_login.rhtml is called.
but when i hitting url on local host it will give the error for nil session for user.

full error trace:-

Processing LoginController#user_login (for 127.0.0.1 at 2011-12-16 13:40:23) [GET]
Rendering template within layouts/main_bk_layout
Rendering login/user_login

ActionView::TemplateError (You have a nil object when you didn’t expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]) on line #61 of app/views/layouts/main_bk_layout.rhtml:
58: <%if @session != nil%>
59:


60: <%else%>
61: <%if @session[‘user’].first_name == “admin”%>
62:

63: <%end%>
64: <%end%>
app/views/layouts/main_bk_layout.rhtml:61:in `_run_rhtml_app47views47layouts47main_bk_layout46rhtml'
D:/Ruby187/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
D:/Ruby187/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:162:in `start'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:95:in `start'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:92:in `each'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:92:in `start'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:23:in `start'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:82:in `start'
-e:2:in `load'
-e:2

Rendered rescues/_trace (46.9ms)
Rendered rescues/_request_and_response (15.6ms)
Rendering rescues/layout (internal_server_error)
[4;36;1mSQL (0.0ms)[0m [0;1mSET SQL_AUTO_IS_NULL=0[0m
[4;35;1mCountry Load (0.0ms)[0m [0mSELECT * FROM countries [0m

Processing LoginController#user_login (for 127.0.0.1 at 2011-12-16 13:40:27) [GET]
Rendering template within layouts/main_bk_layout
Rendering login/user_login

ActionView::TemplateError (You have a nil object when you didn’t expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]) on line #61 of app/views/layouts/main_bk_layout.rhtml:
58: <%if @session != nil%>
59:


60: <%else%>
61: <%if @session[‘user’].first_name == “admin”%>
62:

63: <%end%>
64: <%end%>
app/views/layouts/main_bk_layout.rhtml:61:in `_run_rhtml_app47views47layouts47main_bk_layout46rhtml'
D:/Ruby187/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
D:/Ruby187/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:162:in `start'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:95:in `start'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:92:in `each'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:92:in `start'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:23:in `start'
D:/Ruby187/lib/ruby/1.8/webrick/server.rb:82:in `start'
-e:2:in `load'
-e:2

I don't know what @session is or is supposed to be, but you've got
your if statement back to front - you're trying to access
@session['user'] when @session is nil

Fred

hi Michael ,

Please don't top-post. I can't *make* you not do it, but I can decline
to reply in future :-/

this full trace of the error below.i am new in ROR ,so can you tell me how
to set session in ROR?
and if set session is coming null then can set it?

I have no idea what you mean "set session". You have an instance
variable called "@session", which you're using in a way that makes me
think it's a hash.

full error trace:-
ActionView::TemplateError (You have a nil object when you didn't expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]) on line #61 of
app/views/layouts/main_bk_layout.rhtml:
58: <%if @session != nil%>
59: <table width="250" border="0" height="20"
align="right" cellspacing="0" cellpadding="0">
60: <%else%>
61: <%if @session['user'].first_name == "admin"%>
62: <table width="290" border="0" height="20"
align="right" cellspacing="0" cellpadding="0">
63: <%end%>
64: <%end%>

Okay... after a second read through the confusion becomes clear. The
error tells you that line 61 is the problem - and shows it is where
you're accessing "@session['user']" - but looking at the conditional
code, you're checking if @session is *not* nil and performing a block
in that event, and then in your "else" block (where @session *is*
nil), you access @session, which obviously crashes because @session is
nil.

I think you need to review the logical flow of the code.

HTH