Saving, Editing or Syncing creates error message. Deleting items is fine (support info and debugged error message screenshot included)

Hi there. Like the title of the post says, I am unable to modify, add, or sync anything without getting an error message. I turned on debug mode and ran the error again to collect as much info as I could.

Here is my support info:

PHP Version : 7.4.33

MySQL Version : 5.5.5-10.3.39-MariaDB

Server Information : Linux odedi201075.mywhc.ca 4.18.0-477.10.1.lve.el8.x86_64 #1 SMP Wed May 17 07:12:55 EDT 2023 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/118.0.0.0 Safari/537.36  

Joomla : 3.10.12

component_com_jevents : 3.6.67

component_com_jce : 2.9.41

component_com_comprofiler : 2.8.2

component_com_acymailing : 5.10.25

module_mod_acymailing : 3.7.0

module_mod_jevents_cal : 3.6.67

module_mod_jevents_custom : 3.6.67

module_mod_jevents_filter : 3.6.67

module_mod_jevents_latest : 3.6.67

module_mod_jevents_legend : 3.6.67

module_mod_jevents_switchview : 3.6.67

plugin_actionlog_jevents : 3.6.67 (not enabled)

plugin_acymailing_calltoaction : 1.1.3 (not enabled)

plugin_acymailing_contentplugin : 3.7.0 (not enabled)

plugin_acymailing_geolocation : 5.10.25 (not enabled)

plugin_acymailing_leaguefilter : 3.8.0

plugin_acymailing_managetext : 1.0.0

plugin_acymailing_memberhistoryfilter : 3.8.0 (not enabled)

plugin_acymailing_membershipfilter : 3.8.0

plugin_acymailing_online : 3.7.0

plugin_acymailing_plginboxactions : 5.10.25 (not enabled)

plugin_acymailing_regfilter : 1.0.1 (not enabled)

plugin_acymailing_share : 1.0.0

plugin_acymailing_skipfilter : 3.8.0

plugin_acymailing_stats : 3.7.0

plugin_acymailing_tablecontents : 1.0.0

plugin_acymailing_tagcontent : 3.7.0

plugin_acymailing_tagmodule : 5.10.25 (not enabled)

plugin_acymailing_tagsubscriber : 5.10.25

plugin_acymailing_tagsubscription : 5.10.25

plugin_acymailing_tagtime : 5.10.25

plugin_acymailing_taguser : 5.10.25

plugin_acymailing_template : 5.10.25

plugin_acymailing_urltracker : 5.10.25 (not enabled)

plugin_acymailing_volunteerfilter : 3.8.0

plugin_content_jevents : 3.6.67

plugin_editors_acyeditor : 5.10.25

plugin_eventbooking_acym : 4.5.1 (not enabled)

plugin_finder_jevents : 3.6.67 (not enabled)

plugin_installer_jeventsinstaller : 3.6.67 (not enabled)

plugin_search_eventsearch : 3.6.67 (not enabled)

plugin_system_acymailingclassmail : 5.10.25 (not enabled)

plugin_system_acymailingurltracker : 5.10.25 (not enabled)

plugin_system_gwejson : 3.6.67

plugin_system_sendinarticle : 5.10.25 (not enabled)

And here is my error message:


Any help interpreting what might be going wrong would be appreciated.

Additional info:
-We are a not-for-profit local sports centre (curling) that cannot upgrade to Joomla 4 as the extension that runs our teams/schedule/etc is not compatible with 4 yet.
-I do not have access to anything except the Joomla control panel.
-My last experience working with and building sites with Joomla was about a decade ago, so I am pretty rusty.

Thank you!!