Hello,
I've tried to compile 1.8.9 branch with gradle but I have already the same error.

See the image.
Please I beg you help me to compile it. Because I'm building a modpack 1.8.9.
I don't want 1.9
Thanks !

You're not compiling with cofh RF API. Note that I can't support 1 8.9-related issue reports if you encounter any problems.

OK thank you for your answer.
I try it tonight.
I'll tell you when it's done.
Thanks. :)