Compilation error

[jbrepogmailcom]

Hello. I download all three files in one directory. Then I open .ino with Arduino IDE and want to compile, get these errors. Any advice please?

/tmp/arduino_build_202356/sketch/ulp_adc.ino.cpp.o:(.literal._Z5setupv+0xc): undefined reference to `_binary_ulp_main_bin_end'
/tmp/arduino_build_202356/sketch/ulp_adc.ino.cpp.o:(.literal._Z5setupv+0x10): undefined reference to `_binary_ulp_main_bin_start'
/tmp/arduino_build_202356/sketch/ulp_adc.ino.cpp.o:(.literal._Z5setupv+0x28): undefined reference to `ulp_low_threshold'
/tmp/arduino_build_202356/sketch/ulp_adc.ino.cpp.o:(.literal._Z5setupv+0x2c): undefined reference to `ulp_high_threshold'
/tmp/arduino_build_202356/sketch/ulp_adc.ino.cpp.o:(.literal._Z5setupv+0x3c): undefined reference to `ulp_sample_counter'
/tmp/arduino_build_202356/sketch/ulp_adc.ino.cpp.o:(.literal._Z5setupv+0x48): undefined reference to `ulp_ADC_reading'
/tmp/arduino_build_202356/sketch/ulp_adc.ino.cpp.o:(.literal._Z5setupv+0x50): undefined reference to `ulp_entry'
collect2: error: ld returned 1 exit status
exit status 1
Error compiling for board ESP32 Wrover Module.