Incorrect install, putting the FAR folder in the wrong directory, not copying over ModuleManager, or not copying over ModularFlightIntegrator. The solution is to reinstall FAR from the zip file correctly.
Another mod is reverting FAR's changes to control surfaces. In that case, this is not a FAR issue.
after installing the latest version of your mod all tailfins canards and elevators do not respond and act like fixed parts.