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2013-05-23 12:34 AM
Try to clear the catche on the settings -apps then restart the phone this sorted it for me.. Still shouldn't be happening let me know if it works good luck m8
2013-06-19 04:29 PM
You are not alone. Exact same issue and behaviour. I've even tried restoring phone from computer to no avail.
Seems like a software issue. Video camera wouldn't record 'unknown error'. No videos in album. Rebooted phone, now it records and in addition I have broken videos in album (assume blank) for previous efforts. Could there be some write access issues with external sdcard or other software interfering?
Wonder how widespread this issue is?
2013-06-19 04:44 PM
I finally contacted Sony Xperia Support about the issue and they asked for the phone to be sent in for repair as it wasn't an issue that could be resolved easily. Its probably best if you send your handset in for repair.
(I sent the phone in as having a 'Camera Fault' and have looked up the repair status and Sony seem to have found an 'Operation' issue which causes freezing/hanging/locking up)
So this could be the root cause of the 'unknown error' problem.
2013-09-22 10:08 PM
I finally have found the guilty! at least in my case.
I almost went crazy with this problem, but with patience, root, and eight backups I realize that a liitle and usefull app called magicjack was stopping my microphone for a recorder and video recorder use
Maybe somo of you has the same app installed or another internet calling app causing the issue
Hope it helps
2013-10-22 06:58 AM
I had exactly the same issue, uninstalled a dozen apps trying to find the culprit and suddenly rememebred I had just installed OpenMic+ which uses the Mic to constantly listen for voice prompts for Google Now. Disabling that solved the "unknown Error" on the video camera. Check your audio apps guys - that may be the problem.
2013-11-21 07:12 PM
2014-03-13 12:57 AM
2014-03-13 05:24 PM
Download sony update service and repair your device:
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2015-12-03 05:36 PM
Similar to other here. I had installed a program that records phone conversations. It took over the mic and caused the video error. Deleting cache for the camera apps didn't fix the problem for me.
2018-06-22 08:07 AM
When i open back cam unknown error pops up, by swiping to M or video or any other mode then it come 'camera is used by another application plz close other application'
Front cam is working properly