I installed Appointments+ via the dashboard on a multisite install, and when I click on Network activate, it doesn't work! On firefox I get "connection reset" and on Chrome "No data Received"
I tried many times to delete and re-install but the same result.
When I tried to activate from a site (not the network), I get the following error: Fatal error: Cannot redeclare class URI_Template_Parser in /usr/home/webcv4me.com/htdocs/wp-content/plugins/userpro/lib/google/src/external/URITemplateParser.php on line 30
So it seems for some reason, there is some conflict with another plugin I am using - UserPro codecanyon.net/item/userpro-user-profiles-with-social-login/5958681?WT.ac=solid_search_thumb&WT.seg_1=solid_search_thumb&WT.z_author=DeluxeThemes (suggested by @Jack Kitterhing in this thread https://premium.wpmudev.org/forums/topic/social-login-with-gmail-how).
Any pointers or help will be greatly appreciated.