After upgrade get an error when edit page

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This is the error I get after I try to edit a page:

Fatal error: View::render() [<a href='function.View-render'>function.View-render</a>]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition &quot;PHPCodeBlockController&quot; of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in /var/www/html/updates/concrete5.4.1/concrete/libraries/view.php on line 734

Any ideas?

ewaite
 
ewaite replied on at Permalink Reply
ewaite
Looks like it has to do with cache. If I disable it the error goes away.
Saxafrass replied on at Permalink Reply
I'm having the same problem. I added a custom block had problems tried to remove it with the dashboard and started getting this error whenever I try to login and edit a page. How do I clear the cache? I assume it's not the browser cache your referring to. Thanks
Saxafrass replied on at Permalink Reply
sorry. . . double post