I have a problem with remaining headers. Can't seem to find the first header "RtcUtility.h". Anyone how to fix? I've provided a picture for you to see.

Sample picture

Error Messages:

Arduino: 1.8.10 (Windows 7), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Disabled, All SSL ciphers (most compatible), 4M (no SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200"

sample_time:6:24: error: RtcUtility.h: No such file or directory

Multiple libraries were found for "ArduinoOTA.h" #include

Used: C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\libraries\ArduinoOTA ^

Multiple libraries were found for "Wire.h" compilation terminated.

Used: C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\libraries\Wire Multiple libraries were found for "ESP8266WiFi.h" Used: C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\libraries\ESP8266WiFi Multiple libraries were found for "ESP8266mDNS.h" Used: C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\libraries\ESP8266mDNS exit status 1 RtcUtility.h: No such file or directory

This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.

1 Answer 1


Please add the RTC library in the Arduino as below.

Open the Library Manager and search for "Rtc by Makuna" and install.

You can also checkout the Github page for that particular library at



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