How do I fix this Lightmass Error?

I am having an issue with building my project due to some lightmass issue I have no idea how to fix. To be honest, it is the first time I ever seen this issue. Please help so I can continue my project. Thank you in advance.

An update to this post. If any one gets this error, simply clean and verify the Swarm Agent. Apparently it is still a bit Buggy in UE4.23.