Hello Kenneth!
I’m sorry you are having those issues. Let me help you with them.
Could you please let us know if the error message “There was an error fetching the results from your import: Unknown service message” is showing for Facebook imports or other sources too? If they come from Facebook, could you please share the Facebook URL with us?
The HTTP ERROR 500 seems to be a different issue. So, could you please enable WP_DEBUG and WP_DEBUG_LOG ? This will create a debug.log file inside the /wp-content directory.
After that, try navigating a few times into the page where you are having the issue, so that in case there is an error, it will be saved into the debug.log file. Please share that log file with us so we can spot the problem from there.
Thanks,
Victor