Hello. Thank you for contacting the Toolset support.
Well - it looks like there could be the compatibility issue between the third party plugin and Toolset plugins but to ensure that I need more details.
What if you try to add "get_content" function to content template debug from:
=> Toolset => Settings => Front-end Content tab => Theme support for Content Templates
I turned off debugging messages in the Toolset settings, which hid this issue. But I'm a little concerned that I just masked a potential problem. Toolset seems to have Beaver Builder support, but there have been issues lately, with recent Beaver updates.
Well - so the message was showing because you activated the content template debug.
If you see and confirm any compatibility issue with Beaver Builder and Toolset plugins - please feel free to report it by opening the new ticket and share all required information that will help us to debug the issue. This will help other users searching on the forum.