Problem adding events and switching tabs. New user

New to JEvents and just what we need., My first load seemed to go well. I could add dates, switch tabs and the like. Now it has gone pear shaped! The first page works but any activity such as adding dates, switching tabs shows me a screen like this



This from the JEvents

PHP Version : 7.2.1

MySQL Version : 5.7.21-log

Server Information : Linux nix30.qnetau.com 2.6.32-696.18.7.el6.x86_64 #1 SMP Thu Jan 4 17:31:22 UTC 2018 x86_64

Fix jQuery? : Yes

Load JEvents Bootstrap CSS? : Yes

Max Input Vars ? : 1000

Club code set? : No  

User Agent : Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36 OPR/56.0.3051.52  

Joomla : 3.8.13

component_com_jevents : 3.4.48

component_com_jce : 2.6.8

component_com_comprofiler : 2.2.1

module_mod_jevents_cal : 3.4.48

module_mod_jevents_custom : 3.4.48

module_mod_jevents_filter : 3.4.48

module_mod_jevents_latest : 3.4.48

module_mod_jevents_legend : 3.4.48

module_mod_jevents_switchview : 3.4.48

plugin_content_jevents : 3.4.48

plugin_finder_jevents : 3.4.48

plugin_installer_jeventsinstaller : 3.4.48

plugin_search_eventsearch : 3.4.48

plugin_system_gwejson : 3.4.44

I have tried un-installing and re-installing twice.No success.

Any advise very welcome

Regards

Nick