Muzzle flash Effect Not Working Properly?

I’m new to this and I had attached a muzzle flash using a Spawn Emitter attached blueprint and I is giving me strange results when I test it. Is this supposed to be normal? Something tells me it is wrong.

That usually means that shaders haven’t finished compiling or loading for a texture/effect. Check your base effects/textures for the muzzleflash and see if there is a null value somewhere.

Thanks. You are right. I checked the materials and there are some errors in the materials. Strange, I downloaded the files and thought that it was something that I did wrong. Just started learning so I downloaded them from a lesson.