Hello sir. I have compiled a custom Kernelsu boot.img and a manager, and have changed the signature id in the makefile, but..

[mzb98]

Hello sir. I have compiled a custom Kernelsu boot.img and a manager, and have changed the signature id in the makefile, After i install the boot And install my custom manager, it show me "overlayfs is not available",And the "Superuser"page is loading style, never show me the su list. I have put the photo in the attachment。 But if I use the official Manger(the version is the same with my custom manager) and the official signature id of the kernelsu, everything works fine. It's weird .