Issue: attempted to instantiate non-existent classvw_UI_Tab_LikesCollect_Model

This occurs in XenForo 1, if the user has received an alert because someone liked a page the user contributed to.

In library/vw/XenForo/AlertHander/FakeLike.php, add the following method:

I added it to the end of the file and got this error:

An exception occurred: syntax error, unexpected 'public' (T_PUBLIC), expecting end of file in /library/vw/XenForo/AlertHandler/FakeLike.php on line 29

XenForo_Autoloader->autoload()
spl_autoload_call()
class_exists() in XenForo/Model/Alert.php at line 586
XenForo_Model_Alert->_getAlertHandlerFromCache() in XenForo/Model/Alert.php at line 226
XenForo_Model_Alert->_getContentForAlerts() in XenForo/Model/Alert.php at line 77
XenForo_Model_Alert->getAlertsForUser() in XenForo/ControllerPublic/Account.php at line 74
XenForo_ControllerPublic_Account->actionAlertsPopup() in XenForo/FrontController.php at line 369
XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 152
XenForo_FrontController->run() in /public/index.php at line 13

You probably did not add it inside the class.

You are correct.

For some reason this issue re-appeared today. I tried to fix it by upgrading to the latest build but no dice.
I have disabled VW for now.

The code discussed above which was already confirmed working by you is present in RC 3, so it is probably not the same exact issue. There is most likely a different stack trace. Please provide the updated stack trace.

It went away miraculously. Weird.

Someone liked a wiki article I started so I got the error again:
Fatal Error: attempted to instantiate non-existent class vw_UI_Tab_LikesCollect_Model
[vw-core]/model/ui/tab/likescollect/vw.php does not exist or does not contain the specified class.

#0: vw_Hard_Core::fetch_object() in [vw-platform]/library/vw/_hard/core.php at line 766
#1: vw_Hard_Core::model() in [vw-core]/model/ui/vw.php at line 57
#2: vw_UI_Model->check() in [vw-platform]/library/vw/XenForo/NewsFeedHandler/Base.php at line 65
#3: vw_XenForo_NewsFeedHandler_Base->canViewNewsFeedItem() in [vw-platform]/library/XenForo/Model/NewsFeed.php at line 376
#4: XenForo_Model_NewsFeed->_getViewableNewsFeedItems() in [vw-platform]/library/XenForo/Model/NewsFeed.php at line 137
#5: XenForo_Model_NewsFeed->fillOutNewsFeedItems() in [vw-platform]/library/XenForo/Model/NewsFeed.php at line 112
#6: XenForo_Model_NewsFeed->getNewsFeed() in [vw-platform]/library/Milano/LiveFeed/Model/NewsFeed.php at line 7
#7: Milano_LiveFeed_Model_NewsFeed->getNewsFeed() in [vw-platform]/library/XenForo/ControllerPublic/RecentActivity.php at line 30
#8: XenForo_ControllerPublic_RecentActivity->actionIndex() in [vw-platform]/library/Milano/LiveFeed/ControllerPublic/RecentActivity.php at line 7
#9: Milano_LiveFeed_ControllerPublic_RecentActivity->actionIndex() in [vw-platform]/library/XenForo/FrontController.php at line 369
#10: XenForo_FrontController->dispatch() in [vw-platform]/library/XenForo/FrontController.php at line 152
#11: XenForo_FrontController->run() in [vw-platform]/index.php at line 13

Please forward this error to VaultWiki technical support at https://www.vaultwiki.org/support/4X/ or email
support@vaultwiki.org.

Recent-activity no longer works for me.

This occurs in XenForo 1, if the user's page-like is trying to appear in Members > Recent Activity, or a user's news feed of people they follow.

In library/vw/XenForo/NewsFeedHandler/FakeLike.php, add the following method inside the class:

Will this fix be included in RC4?
It seems to be already included in RC3PL1 but it doesn't fix it. If I add the above to the file then the recent activity page will stop working.
Is there another way to resolve this? For example by removing VW from recent activity or removing like functionality from VW?

The above code fixes the issue in NewsFeedHandler only. You may be getting a similar issue which is located in a different file. Please post the trace for the error message you are receiving.

Is it possible to remove VW from the newsfeedhandler?

No, but you can disable liking of pages, which is what uses the FakeLike handler. In Options > VaultWiki: Content Types > Wiki Content Users Can Like. If users can't use those kinds of likes, then they should stop appearing in the news feed.

However, disabling the feature wouldn't be too helpful as you seem to make use of it. Instead, we should try to resolve the error you are receiving. You have not posted an updated error message since the fix was applied, and you previously said the fix worked. That tells me that either you have a new error (which might be similar but would be a different message) or your server has started running off an older version of the files for some reason. Remember, whenever you upload new files or make edits, you tend to need to clear your server's opcode cache. This has been a common issue for your site.