TYPO3 Core

Every time I update an extension in TYPO3 6.2.6 this will result in the following fatal error:

Warning: require_once(/xx/xx/xx/public_html/typo3conf/ext/news/Classes/Utility/Compatibility.php): failed to open stream: No such file or directory in /xx/xx/xx/public_html/typo3_src-6.2.6/typo3/sysext/core/Classes/Core/ClassLoader.php on line 182 Fatal error: require_once(): Failed opening required '/xx/xx/xx/public_html/typo3conf/ext/news/Classes/Utility/Compatibility.php' (include_path='/xx/xx/xx/public_html/typo3/contrib/pear/:.:/usr/local/lib/php') in /xx/xx/xx/public_html/typo3_src-6.2.6/typo3/sysext/core/Classes/Core/ClassLoader.php on line 182

What did I do?
Delete all cache > go to Extension manager > click on update icon > blue popup screen reports the extension has been updated. After that both BE and FE will output the fatal error.

The only way to get rid of it is to manually delete all files in the directory cache_core.
If I then try to update another extension, TYPO3 will generate the same error.

Also tried to delete all files in the directory cache_core and then update the extension, but this will result in the same fatal error. So it seems that somehow TYPO3 generates wrong cache files, or that the are not updated after the update of the extension.

Enabling or disabling an extension will not trigger the error.