Problem adding blocks since upgrading

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Help I've just upgraded to the latest version but ow when I try to inset a block on my site I now get the following message instead of a list of blocks to add. I'm a bit of a novice and have no idea what to do:

Warning: require_once(/home/memorylo/public_html/lubel.info/updates/concrete5.6.0.1/concrete/models/json.php) [function.require-once]: failed to open stream: No such file or directory in /home/memorylo/public_html/lubel.info/updates/concrete5.6.0.1/concrete/core/libraries/loader.php on line 40

Fatal error: require_once() [function.require]: Failed opening required '/home/memorylo/public_html/lubel.info/updates/concrete5.6.0.1/concrete/models/json.php' (include_path='/home/memorylo/public_html/lubel.info/libraries/3rdparty:/home/memorylo/public_html/lubel.info/updates/concrete5.6.0.1/concrete/libraries/3rdparty:.:/usr/lib/php:/usr/local/lib/php') in /home/memorylo/public_html/lubel.info/updates/concrete5.6.0.1/concrete/core/libraries/loader.php on line 40

 
sunraySte replied on at Permalink Reply
sunraySte
I have had the same problem since upgrading. Everytime I go to add a block I get this message..

Warning: require_once(/home/sites/dis-creet.co.uk/public_html/updates/concrete5.6.0.1/concrete/models/json.php) [function.require-once]: failed to open stream: No such file or directory in /home/sites/dis-creet.co.uk/public_html/updates/concrete5.6.0.1/concrete/core/libraries/loader.php on line 40

Fatal error: require_once() [function.require]: Failed opening required '/home/sites/dis-creet.co.uk/public_html/updates/concrete5.6.0.1/concrete/models/json.php' (include_path='/home/sites/dis-creet.co.uk/public_html/libraries/3rdparty:/home/sites/dis-creet.co.uk/public_html/updates/concrete5.6.0.1/concrete/libraries/3rdparty:.:/usr/share/pear5') in /home/sites/dis-creet.co.uk/public_html/updates/concrete5.6.0.1/concrete/core/libraries/loader.php on line 40

Could do with some pointers on how to fix this problem urgently please guys.
sunraySte replied on at Permalink Reply
sunraySte
Sorted it...

http://www.concrete5.org/community/forums/installation/5.6-upgrade-...

This answer explained the process to fixing the problem!
lubeld replied on at Permalink Reply
Thanks. I sorted it by copying the json.php file as suggested in the other thread.