module doesn't export mod_opt_type/1

[oladipo]

I tried to start ejabberd 17.04 with this module compiled but it prevents ejabberd from starting with the error:

   **"module doesn't export mod_opt_type/1"**

Apparently it seems gen_mod.erl 's get_validators/3 checks every module for the presence of this function to get the module options. Is there a version somewhere that implements and exports mod_opt_type/1 ?