How to fix Encoding Overloaded in OBS Studio?
Encoding overloaded means that your computer isn't fast enough to encode with the settings as they are now. 

There are two options: 1) Encode via hardware (intel quicksync, AMD VCE, Nvidia nvenc) or set the quality of the encode lower (as in a faster/fastest x264 preset).

Without more information (CPU, GPU, Ram, OS etc) it is difficult to know what is the best way forward.