Error message- remove lens cap and press > button

after changing the battery and gently push back on the lens it should automatically close if not then check around it it must be something stuck in between it

Check details and solve tips in this link: fixing-lens-error-on-digital-camera.html

Hi,

The Lens Error is displayed on the LCD screen when the Lens Mechanism is stuck or when affected by any malfunction. If turning the power on and off again does not resolve the error message, try doing a power reset and Initialize option.
Performing a manual power reset
Turn off the camera.
Remove the battery pack.
Press and hold the power button for 30 seconds.
Allow the camera to remain without power for 60 seconds.
Reinsert the battery pack.
Turn on the camera.
You can reset the Camera back to factory default by performing the following steps:
Press the power button.
Press and hold the MENU button for more than 5 seconds. Default Settings will get displayed.
Use the arrow buttons to select OK and press the FUNC./SET button. This will reset all the settings back to factory deafult.
This should resolve the issue. If the issue persists, service may be required.

Thanks for contacting FixYa

1. Turn off the camera. 2. Remove the lens, battery, and CF card. 3. Allow the camera to sit without power for approximately 20 minutes. 4. Insert a fully charged battery, and turn on the camera. 5. Depress the shutter button as you would to take a picture. Does the "ERR ' message appear? If it does, then the camera should be serviced. If it does not, then please proceed to the next set of steps: 1. Turn off the camera. 2. Insert the CF card. 3. Turn on the camera. 4. Format the CF card in the camera. 5. Depress the shutter button as you would to take a picture. Does the "ERR ' message appear? If so, then the CF card is the most likely source of the issue. Try using a different card. If the message does not appear, please complete the following steps: 1. Turn off the camera. 2. Clean the lens contacts by gently rubbing them with a pencil eraser or soft cloth. Be careful that you do not let any debris fall into the camera body. 3. Reattach your lens. 4. Turn on the camera. 5. Depress the shutter button as you would to take a picture. If the "ERR ' message only appears when one particular lens is attached, then that lens should be examined by a service technician. If you see the "ERR ' with a different Canon lens attached, then the camera should be serviced.

CANON IXUS 561
Lens sometimes does not extend and error message 'lens error restart camera' appears when camera is turned on. This does not work without several tries and much button pressing. Problem is not caused by finger(s) in front of lens barrel.

1. Power off
2. Remove the battery.
3. Put the battery to its place
4. Power on
5. If nothing happens
6. Replace the battery with charged one
7. Power on again

It should be work.

After reading di_nick34 solution about removing sand, I removed the lens hood adaptor, and blew air between the gap, re-screw adaptor on. Heard a few clicks - must have broken some minute dust/dirt. Remove hood again, and further blowing. Must have removed the dirt stuck in the gap. Camera now works fine. Hope others with similar problem waill have same success.

Not sure about the pattern of errors, but the advice for error 99 diagnosis is to try the following diagnosis steps to isolate the cause of the issue:-
1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert only a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, the camera may be faulty and requires a service. If it does not, then: -
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, then the CF card is faulty. Try a different card. If the message does not appear: -
1. Turn off the camera.
2. Clean the gold contacts on the lens by GENTLY rubbing them with a pencil eraser or soft cloth. Keeping the camera face pointing down, also clean the gold contacts on the camera, being careful that you do not let any debris fall into the camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.

If the “ERR 99" message only appears when one particular lens is attached, then that lens should be examined by a service technician.
If you see the “ERR 99" with a different Canon lens attached, then the camera is faulty and should be serviced.

To isolate the cause of the issue, we suggest that you do the following:

1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99′ message appear? If it does, then the camera should be serviced. If it does not, then please proceed to the next set of steps:

1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99′ message appear? If so, then the CF card is the most likely source of the issue. Try using a different card.
If the message does not appear, please complete the following steps:

1. Turn off the camera.
2. Clean the lens contacts by gently rubbing them with a pencil eraser or soft cloth. Be careful that you do not let any debris fall into the camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.

If the “ERR 99′ message only appears when one particular lens is attached, then that lens should be examined by a service technician.
If you see the “ERR 99′ with a different Canon lens attached, then the camera should be serviced.

Your camera probably doesn't have a problem. Mount a lens on it and turn the aperture to the smallest opening = F/22 or F/32 then try it.