raspberry pi camera not working

[oliver]

hi i keep getting this error when trying to connect my pi noircamera it was working well and then it stopped working

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mmal: mmal_vc_component_create: failed to create component 'vc.ril.camera' (1:ENOMEM)
mmal: mmal_component_create_core: could not create component 'vc.ril.camera' (1)
mmal: Failed to create camera component
mmal: main: Failed to create camera component
mmal: Camera is not enabled in this build. Try running "sudo raspi-config" and ensure that "camera" has been enabled

when i try and enable the camera again

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there was an error running option 5 enable camera

i have tried the clicking the sunny connecter in on the camera but it did nothing

i am running raspian and when i try updating the system with

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sudo rpi-update 

but i get this

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pi@ollyspi ~ $ sudo rpi-update
 *** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
 *** Performing self-update
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   135  100   135    0     0    169      0 --:--:-- --:--:-- --:--:--   218
100  7026  100  7026    0     0   6458      0  0:00:01  0:00:01 --:--:--  6458
 *** Relaunching after update
 *** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
 *** We're running for the first time
 *** Backing up files (this will take a few minutes)
 *** Backing up firmware
cp: reading `/boot/config.txt': Input/output error
cp: failed to extend `/boot.bak/boot/config.txt': Input/output error

[oliver]

i am using a model b raspberry pi and am using the pi and camera over ssh and vnc

thanks in advance