I have found that but when I importing fixtures, they are nowhere to be found. I have to create events for them to show up. My question is why import fixtures if they don’t show up?
I am having this issue as well. I am using the newest version of the plug-in 1.3.88 and the only error is on this /wp-content/plugins/ultimate-member/core/lib/upload/um-image-upload.php