Hello, I know this is an old question but for those who found this when searching on google.
I Found an answer here
As described in above link,
It fixed by removing the usage of “World Context” input parameter or something like that.
In order to find a similar errors in your project “idkwhateverdude” suggested to use the blueprint search (https://docs.unrealengine.com/en-US/...rch/index.html)
and search for “World Context” on your blueprints