I've noticed this before, once I activate certain modules on our Library URL, error message shown.
however this time, I have updated a few plugins, and installed a few modules, but I couldn't figure out which one is in conflict with Library.
Here is the error message: ............/administrator/components/com_booklibrary/admin.booklibrary.class.ws.php on line 1
from the url: www.acatcm.com/library
Any assistant will be greatly appreciated!