Warning & Fatal Error after upgrading

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Hi, I just upgraded to the latest version, everything appears to be fine except when trying to add a block to a page. I get this error message, and have no clue what it means. Help please? Thanks much :)

Warning: require_once(/home1/charbeec/public_html/snbbr/updates/concrete5.6.2.1_updater/concrete/models/json.php) [function.require-once]: failed to open stream: No such file or directory in /home1/charbeec/public_html/snbbr/updates/concrete5.6.2.1_updater/concrete/core/libraries/loader.php on line 48
Fatal error: require_once() [function.require]: Failed opening required '/home1/charbeec/public_html/snbbr/updates/concrete5.6.2.1_updater/concrete/models/json.php' (include_path='/home1/charbeec/public_html/snbbr/libraries/3rdparty:/home1/charbeec/public_html/snbbr/updates/concrete5.6.2.1_updater/concrete/libraries/3rdparty:.:/usr/lib/php:/usr/local/lib/php') in /home1/charbeec/public_html/snbbr/updates/concrete5.6.2.1_updater/concrete/core/libraries/loader.php on line 48

 
goldhat replied on at Permalink Reply
I don't have a really good answer for you but that error message is saying that your C5 is looking for a file at /concrete/models/json.php in the new version C5.6.2.1. And I just checked for that file and it's not supposed to be there. I'm not sure why your C5 install would expect it.

Have you found a way around this since you posted? If not this will bump the post maybe somebody else has an idea something you can try. Have you tried clearing cache for the site? Maybe something from the older version is still being loaded.
charbee replied on at Permalink Reply
No, I haven't found a solution yet :/ It's strange that the error is only for a block, not for a stack or anything else. Yes I did clear the cache. Thanks for looking :)