Thanks for reaching out to us and welcome to the support forums!
This might be a conflict between installed products versions. Can you please share your system info with me? Please check this knowledge base article about Sharing your system information, if you prefer to do so you can mark your reply as private.
From what I see in the sys info you shared, yo don’t have Event Calendar PRO installed. Can you confirm this? Both Photo view and Mini Calendar Widget are features enabled by Event Calendar PRO.
Yes we had Pro that’s why I was wondering what happened – my developer purchased the original licence because it was for 3 sites – what do you need from me to get this working?
It seems PRO is not active any more on the site. Not sure if it’s installed at all. Can you check on that please – in your site ‘WP-Admin > Plugins > Installed plugins’ look for The Events Calendar PRO? If it’s not installed, you can download the latest version from this site (top bar > My Account > Downloads) and install it.