Redmine

I i have a problem after installation

Rails 2.3.14
ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]
ubuntu server 12.04
DB is Mysql

when launch http://localhost/redmine i have this error page:

i have the error message No such file or directory - /etc/redmine/default/session.yml (Errno::ENOENT)
and i do not understand it

No such file or directory - /etc/redmine/default/session.yml (Errno::ENOENT)
  /usr/lib/ruby/1.8/yaml.rb:143:in `initialize'
  /usr/lib/ruby/1.8/yaml.rb:143:in `open'
  /usr/lib/ruby/1.8/yaml.rb:143:in `load_file'
  /usr/share/redmine/config/environment.rb:32
  /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
  /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:36:in `require'
  /var/lib/gems/1.8/gems/passenger-4.0.21/helper-scripts/classic-rails-preloader.rb:92:in `preload_app'
  /var/lib/gems/1.8/gems/passenger-4.0.21/helper-scripts/classic-rails-preloader.rb:179
Application root
/usr/share/redmine
Environment (value of RAILS_ENV, RACK_ENV, WSGI_ENV and PASSENGER_ENV)
production
Ruby interpreter command
/usr/bin/ruby1.8
User and groups
uid=33(www-data) gid=33(www-data) groups=33(www-data)
Environment variables
APACHE_RUN_DIR = /var/run/apache2
APACHE_PID_FILE = /var/run/apache2.pid
PATH = /usr/local/bin:/usr/bin:/bin
APACHE_LOCK_DIR = /var/lock/apache2
LANG = C
APACHE_RUN_USER = apache2
APACHE_RUN_GROUP = apache2
APACHE_LOG_DIR = /var/log/apache2
PWD = /usr/share/redmine
PASSENGER_DEBUG_DIR = /tmp/passenger.spawn-debug.XXXXDZ6IL5
USER = www-data
LOGNAME = www-data
SHELL = /bin/sh
HOME = /var/www
IN_PASSENGER = 1
PYTHONUNBUFFERED = 1
NODE_PATH = /var/lib/gems/1.8/gems/passenger-4.0.21/node_lib
RAILS_ENV = production
RACK_ENV = production
WSGI_ENV = production
PASSENGER_ENV = production
RAILS_RELATIVE_URL_ROOT = /redmine
RACK_BASE_URI = /redmine
PASSENGER_BASE_URI = /redmine
SERVER_PROTOCOL = HTTP/1.1
SERVER_SOFTWARE = Apache/2.2.22 (Ubuntu)
DOCUMENT_ROOT = /var/www
SERVER_ADMIN = webmaster@localhost
QUERY_STRING = 
SERVER_NAME = 148.143.17.88
REMOTE_PORT = 61781
REMOTE_ADDR = 192.168.0.17
SERVER_PORT = 80
REQUEST_METHOD = GET
SERVER_ADDR = 148.143.17.88
REQUEST_URI = /redmine
X_DEBIAN_SITEID = default
RAILS_ETC = /etc/redmine/default
RAILS_LOG = /var/log/redmine/default
RAILS_VAR = /var/lib/redmine/default
RAILS_CACHE = /var/cache/redmine/default
SCHEMA = /var/cache/redmine/default/schema.db
Ulimits
Unknown
System memory usage
             total       used       free     shared    buffers     cached
Mem:           994        863        131          0         17        265
-/+ buffers/cache:        580        413
Swap:          507          0        507
General Ruby interpreter information
RUBY_VERSION = 1.8.7
RUBY_PLATFORM = x86_64-linux
RUBY_ENGINE = nil
RubyGems version = 1.8.15
Ruby configuration (RbConfig::CONFIG)
CPP = gcc -E
CC = gcc
WINDRES = 
topdir = /usr/lib/ruby/1.8/x86_64-linux
COMMON_LIBS = 
CFLAGS = -fno-strict-aliasing -g -g -O2  -fPIC  
RUBY_SO_NAME = ruby1.8
sbindir = /usr/sbin
rubylibdir = /usr/lib/ruby/1.8
DEFS = 
localedir = /usr/share/locale
TEENY = 7
NM = 
LIBRUBY_LDSHARED = gcc -shared
MANTYPE = doc
RPATHFLAG = 
DLDLIBS =  -lc
DLLWRAP = 
PACKAGE_STRING = 
datadir = /usr/share
RANLIB = ranlib
host_cpu = x86_64
CPPFLAGS = -D_FORTIFY_SOURCE=2  -D_FORTIFY_SOURCE=2
YACC = bison -y
build_vendor = pc
CP = cp
RUBY_INSTALL_NAME = ruby1.8
PATCHLEVEL = 352
EGREP = /bin/grep -E
vendorlibdir = /usr/lib/ruby/vendor_ruby/1.8
host_os = linux-gnu
MAKEDIRS = mkdir -p
debugflags = 
EXTOUT = .ext
AR = ar
DLDFLAGS = 
rubyw_install_name = 
RUBYW_INSTALL_NAME = 
psdir = /usr/share/doc/$(PACKAGE)
RM = rm -f
OBJDUMP = 
CPPOUTFILE = -o conftest.i
ECHO_C = 
bindir = /usr/bin
ruby_version = 1.8
build_os = linux-gnu
LIBPATHFLAG =  -L%s
LDSHARED = gcc -shared
libexecdir = /usr/lib/ruby1.8
prefix = /usr
INSTALL_SCRIPT = /usr/bin/install -c
PREP = miniruby
MAJOR = 1
PACKAGE_BUGREPORT = 
sitearch = x86_64-linux
SOLIBS = -lpthread -lrt -ldl -lcrypt -lm 
LIBPATHENV = LD_LIBRARY_PATH
cflags =  
RDOCTARGET = 
oldincludedir = /usr/include
NROFF = /usr/bin/nroff
LIBRUBYARG = -lruby1.8
exec_prefix = /usr
configure_args =  '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=/usr/include' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--libexecdir=/usr/lib/ruby1.8' '--srcdir=.' '--disable-maintainer-mode' '--disable-dependency-tracking' '--disable-silent-rules' '--program-suffix=1.8' '--enable-pthread' '--enable-shared' '--enable-ipv6' '--disable-rpath' '--disable-install-doc' '--with-sitedir=/usr/local/lib/site_ruby' '--with-default-kcode=none' '--with-dbm-type=gdbm_compat' '--with-tklib=tk8.4' '--with-tcllib=tcl8.4' '--with-tcl-include=/usr/include/tcl8.4' '--with-bundled-sha1' '--with-bundled-md5' '--with-bundled-rmd160' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-fno-strict-aliasing -g -g -O2' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2'
INSTALL_PROGRAM = /usr/bin/install -c
ENABLE_SHARED = yes
mandir = /usr/share/man
OBJEXT = o
GREP = /bin/grep
LIBRUBYARG_SHARED = -lruby1.8
target_alias = 
docdir = /usr/share/doc/$(PACKAGE)
dvidir = /usr/share/doc/$(PACKAGE)
MAINLIBS = 
archdir = /usr/lib/ruby/1.8/x86_64-linux
ruby_install_name = ruby1.8
INSTALL_DATA = /usr/bin/install -c -m 644
COMMON_HEADERS = 
AS = as
PACKAGE_VERSION = 
pdfdir = /usr/share/doc/$(PACKAGE)
sitedir = /usr/local/lib/site_ruby
LIBRUBY = libruby1.8.so.1.8.7
LIBRUBY_SO = libruby1.8.so.1.8.7
vendordir = /usr/lib/ruby/vendor_ruby
SET_MAKE = 
DESTDIR = 
sitearchdir = /usr/local/lib/site_ruby/1.8/x86_64-linux
PACKAGE_NAME = 
setup = Setup
DLEXT2 = 
YFLAGS = 
sitelibdir = /usr/local/lib/site_ruby/1.8
SHELL = /bin/bash
PACKAGE_URL = 
optflags = 
ARCH_FLAG = 
DLEXT = so
GNU_LD = yes
ARCHFILE = 
host_alias = 
PATH_SEPARATOR = :
PACKAGE_TARNAME = 
LIBRUBY_ALIASES = libruby1.8.so.1.8 libruby1.8.so
target_vendor = pc
CCDLFLAGS =  -fPIC
STRIP = strip -S -x
LIBRUBY_A = libruby1.8-static.a
LDFLAGS = -L. -Wl,-Bsymbolic-functions -Wl,-z,relro -rdynamic -Wl,-export-dynamic
target = x86_64-pc-linux-gnu
LN_S = ln -s
LINK_SO = 
build_cpu = x86_64
sysconfdir = /etc
LIBRUBY_DLDFLAGS = -Wl,-soname,libruby1.8.so.1.8
TRY_LINK = 
EXEEXT = 
host_vendor = pc
EXPORT_PREFIX = 
ASFLAGS = 
infodir = /usr/share/info
htmldir = /usr/share/doc/$(PACKAGE)
ALLOCA = 
LIBS = -lpthread -lrt -ldl -lcrypt -lm 
COMMON_MACROS = 
MINOR = 8
ECHO_T = 
target_os = linux
EXTSTATIC = 
build = x86_64-pc-linux-gnu
MAKEFILES = Makefile
LIBRUBYARG_STATIC = -lruby1.8-static
vendorarchdir = /usr/lib/ruby/vendor_ruby/1.8/x86_64-linux
libdir = /usr/lib
ECHO_N = -n
build_alias = x86_64-linux-gnu
localstatedir = /var
includedir = /usr/include
STATIC = 
INSTALL = /usr/bin/install -c
LIBEXT = a
host = x86_64-pc-linux-gnu
OUTFLAG = -o 
arch = x86_64-linux
datarootdir = /usr/share
sharedstatedir = /usr/com
cppflags = -D_FORTIFY_SOURCE=2
target_cpu = x86_64
Activated Ruby gems
rails => 2.3.14
activesupport => 2.3.14
activerecord => 2.3.14
activeresource => 2.3.14
actionmailer => 2.3.14
actionpack => 2.3.14
Ruby load path ($LOAD_PATH)
/usr/share/redmine/app/controllers/
/usr/share/redmine/app
/usr/share/redmine/app/models
/usr/share/redmine/app/controllers
/usr/share/redmine/app/helpers
/usr/share/redmine/lib
/usr/share/redmine/vendor
/usr/share/redmine/vendor/rails/railties
/usr/share/redmine/vendor/rails/railties/lib
/usr/share/redmine/config/../vendor/rails/railties/lib
/var/lib/gems/1.8/gems/passenger-4.0.21/lib
/usr/local/lib/site_ruby/1.8
/usr/local/lib/site_ruby/1.8/x86_64-linux
/usr/local/lib/site_ruby
/usr/lib/ruby/vendor_ruby/1.8
/usr/lib/ruby/vendor_ruby/1.8/x86_64-linux
/usr/lib/ruby/vendor_ruby
/usr/lib/ruby/1.8
/usr/lib/ruby/1.8/x86_64-linux
.
Ruby loaded libraries ($LOADED_FEATURES)
enumerator.so
phusion_passenger.rb
rbconfig.rb
etc.so
fileutils.rb
tmpdir.rb
phusion_passenger/utils/tmpio.rb
phusion_passenger/platform_info.rb
phusion_passenger/platform_info/operating_system.rb
phusion_passenger/platform_info/ruby.rb
phusion_passenger/platform_info/binary_compatibility.rb
/var/lib/gems/1.8/gems/passenger-4.0.21/buildout/ruby/ruby-1.8.7-x86_64-linux/passenger_native_support.so
phusion_passenger/native_support.rb
rubygems/defaults.rb
rubygems/deprecate.rb
rubygems/exceptions.rb
rubygems/custom_require.rb
rubygems.rb
socket.so
thread.so
thread.rb
fcntl.so
phusion_passenger/ruby_core_enhancements.rb
phusion_passenger/utils/tmpdir.rb
phusion_passenger/preloader_shared_helpers.rb
phusion_passenger/public_api.rb
phusion_passenger/debug_logging.rb
phusion_passenger/loader_shared_helpers.rb
phusion_passenger/constants.rb
phusion_passenger/message_channel.rb
phusion_passenger/utils.rb
phusion_passenger/message_client.rb
phusion_passenger/utils/unseekable_socket.rb
phusion_passenger/request_handler/thread_handler.rb
phusion_passenger/request_handler.rb
phusion_passenger/analytics_logger.rb
monitor.rb
logger.rb
set.rb
pathname.rb
railties_path.rb
rails/version.rb
rails/plugin/locator.rb
rails/plugin.rb
rails/plugin/loader.rb
stringio.so
yaml/error.rb
syck.so
yaml/ypath.rb
yaml/basenode.rb
yaml/syck.rb
yaml/tag.rb
yaml/stream.rb
yaml/constants.rb
rational.rb
date/format.rb
date.rb
yaml/rubytypes.rb
yaml/types.rb
yaml.rb
rails/vendor_gem_source_index.rb
rubygems/version.rb
rubygems/requirement.rb
rubygems/dependency.rb
rails/gem_dependency.rb
rails/rack.rb
/usr/share/redmine/config/../vendor/rails/railties/lib/initializer.rb
rubygems/platform.rb
rubygems/specification.rb
rubygems/source_index.rb
rubygems/path_support.rb
rubygems/syck_hack.rb
/usr/share/redmine/config/boot.rb