This happens because one or more of the search results is a wiki page with no revisions. This page is corrupt and should be deleted.
AdminCP > Wiki > Maintenance > Rebuild Counters / Caches > Rebuild URLs. The title for the corrupt page is missing, so its new URL will collide with the wiki index.
AdminCP > Wiki > Maintenance > URL Conflicts. Remove the conflicts with the wiki index.
Once this is done, you should not see these errors any more when using the sidebar search or assignment interfaces.
Fatal Error: attempted to instantiate non-existent class vw_CP_Counter_contribute_Controller_xf
[path]/vault/core/controller/cp/counter/contribute/xf.php does not exist or does not contain the specified class.
#0: vw_Hard_Core::fetch_object() in [path]/vault/core/model/vw.php at line 696
#1: vw_Hard_Core::controller() in [path]/vault/core/view/cp/counter/vw.php at line 32
#2: vw_CP_Counter_View->modify() in [path]/vault/core/controller/cp/counter/vw.php at line 77
#3: vw_CP_Counter_Controller->modify() in [path]/vault/core/controller/cp/counter/vw.php at line 42
#4: vw_CP_Counter_Controller->execute() in [path]/library/vw/XenForo/ControllerAdmin/Wiki.php at line 119
#5: vw_XenForo_ControllerAdmin_Wiki->actionIndex() in [path]/library/XenForo/FrontController.php at line 351
#6: XenForo_FrontController->dispatch() in [path]/library/XenForo/FrontController.php at line 134
#7: XenForo_FrontController->run() in [path]/admin.php at line 13
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