Same problem here, I'm using the light rss module though. I think it has to do with the php version, I don't think php5 supports defining constants on the fly any more. The error in my log is 'DS not defined', I'm guessing they used this same code in most of their stuff. The following code will fix the problem, I just added it to mod_light_rss.php before line 16 when the helper.php file is called.
// fix DS not defined error
if(!defined('DS')) define('DS', DIRECTORY_SEPARATOR);
You're not using that module so look in the root directory of the module/plugin you are using, find the php file with the mod/plugin name, and put it before the first line with DS in it. If that's not your problem, sorry, that's the best guess I got.
I just re-read the original post and realized I misunderstood it, I thought the problem occurred when you enabled autotweet, that's what I get for staying up a couple of days Perhaps an admin could break this post out of this thread and give it an appropriate title?
Last edit: 5 years 9 months ago by kyle l. Reason: doesn't answer the question