I am aware of this WordPress error and what generally causes it, that said, I have never seen that associated with Connections.
A quick Google search shows this is not isolated to Connections. I most the links I read, which hoesntly were only a few, this has happend but the other devs were not able to replicate it. Of course, I can not replicate it either.
According to others, simply going the the PLugins admin page after receiving the message and then activating the plugin will allow the plugin to be activated. So, that’s what I suggest trying.
Hope this helps, let me know.