Everytime I change my config.plust and I install clover UEFI bootloader, I get a prohibited sign.

How can I fix this?? I'm on sierra using unibeast and multibeast. Is that the prob??

Hardware Mobo: ASUS B250-PLUS Processor: Intel i5-6400 GPU: GeForce GTX 1070 RAM: 2x8GB HyperX PSU: NOX 750W