CMake Error: File /cmake/setup_custom_pythonpath.sh.in does not exist.

edit

I have the following lines in my CMakeLists.txt and I am not able to use catkin_make.

generate_dynamic_reconfigure_options(
   config/dyn_reconf.cfg
)

The full error message:

CMake Error: File /cmake/setup_custom_pythonpath.sh.in does not exist.
CMake Error at /opt/ros/melodic/share/dynamic_reconfigure/cmake/dynamic_reconfigure-macros.cmake:42 (configure_file):
  configure_file Problem configuring file
Call Stack (most recent call first):
  ../project/CMakeLists.txt:94 (generate_dynamic_reconfigure_options)

Here is my dyn_reconf.cfg:

#!/usr/bin/env python
PACKAGE = "project"

from dynamic_reconfigure.parameter_generator_catkin import *

gen = ParameterGenerator()

gen.add("Resizing Factor",   double_t, 0, "A float parameter to make the original image's resolution",  0.3) 
gen.add("Hough Circle Upper Threshold", int_t, 0, "One of the Hough parameters", 100)
gen.add("Hough Circle Lower Threshold", int_t, 0, "One of the Hough parameters", 30)
gen.add("Hough Circle Min Radius", int_t, 0, "One of the Hough parameters", 10)
gen.add("Hough Circle Max Radius", int_t, 0, "One of the Hough parameters", 30)

exit(gen.generate(PACKAGE, "project", "dyn_reconf"))

and this is how I imported it:

from dynamic_reconfigure.server import Server
from dyn_reconf.cfg import dyn_reconf

EDIT: Adding the rest of CMakeLists.txt:

EDIT2: Updated CMakeLists.txt:

cmake_minimum_required(VERSION 2.8.3)
project(project)

find_package(catkin REQUIRED COMPONENTS
  image_geometry
  rospy
  sensor_msgs
  std_msgs
  dynamic_reconfigure
)

generate_dynamic_reconfigure_options(
   config/dyn_reconf.cfg
)

catkin_package(
   CATKIN_DEPENDS image_geometry  rospy sensor_msgs std_msgs dynamic_reconfigure
)

include_directories(
  ${catkin_INCLUDE_DIRS}
)

add_dependencies(project ${${PROJECT_NAME}_EXPORTED_TARGETS})