As I mentioned , the conflict prevents Uncanny Learndash Toolkit Pro from activating when the Plugin Organizer plugin is active.
No error message is generated.
When the Plugin Organizer plugin is disabled, the Uncanny Toolkit Pro plugin can be activated without any problem. To test that it wasn’t my Plugin Organizer settings, I disabled all features of the plugin. Still had the same issue.
I am also having this exact error.
I have not yet switched to ‘live’ and am attempting to test a transaction, so I have selected ‘Turn Testing On’