[RSS Feed/News] suddenly getting: Accessed unknown getter 'prefix_id' on XF:ConversationMaster[29] whenever someone starts or replies to a conversation?!

[XenForo]

I disabled all my mods that involve conversations, as well as a few others (including Zodiac signs, shown below). But I keep getting this, and slightly varied server errors (depending on which mod is disabled) whenever a member starts or replies to a conversation. Very strange! I'm stumped. Can anyone help? Thanks!

Here is the exact error:

InvalidArgumentException: Accessed unknown getter 'prefix_id' on XF:ConversationMaster[28] src/XF/Mvc/Entity/Entity.php:213

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