the "files" fail to open . when "files " is clicked it shows desktop instead. nautilus crashed with signal 7

[Muhammad Mokhlesur Rahman]

once in a while. different folders fail to open when clicked. it shows desktop instead.this timethe "files" fail to open . when "files " is clicked it shows desktop instead. cant access any file in my pc. using ubuntu 14.10

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: nautilus 1:3.12.2-0ubuntu1~trusty3 [origin: LP-PPA-gnome3-team-gnome3]
ProcVersionSignature: Ubuntu 3.16.0-30.40-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Feb 15 12:11:19 2015
ExecutablePath: /usr/bin/nautilus
GsettingsChanges:

InstallationDate: Installed on 2015-02-06 (8 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
ProcCmdline: nautilus -n
Signal: 7
SourcePackage: nautilus
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libgvfsdbus.so
 ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libgvfsdbus.so
 ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libgvfsdbus.so
 ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
Title: nautilus crashed with signal 7
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Ubuntu GNOME (ug-bot)]

StacktraceTop:
 verify_array_block (tree=tree@entry=0x7fa3e0001e30, pos=<optimized out>, element_size=element_size@entry=8) at metatree.c:172
 verify_metadata_block (pos=<optimized out>, tree=0x7fa3e0001e30) at metatree.c:186
 meta_tree_lookup_data (tree=tree@entry=0x7fa3e0001e30, path=path@entry=0x7fa3b80040d0 "/") at metatree.c:717
 meta_tree_enumerate_keys (tree=tree@entry=0x7fa3e0001e30, path=0x7fa3b80040f0 "/", callback=callback@entry=0x7fa3f07631c0 <enumerate_keys_callback>, user_data=user_data@entry=0x7fa3ec01ab90) at metatree.c:2076
 g_daemon_vfs_local_file_add_info (vfs=<optimized out>, filename=0x1ba47b0 "/home/russell", device=2051, matcher=<optimized out>, info=0x7fa3ec01ab90, cancellable=<optimized out>, extra_data=0x7fa3c9762b48, extra_data_free=0x7fa3c9762b50) at gdaemonvfs.c:1106