WiFi_Kit_series
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ESP8266SdFat and SoftwareSerial in "WiFi_Kit_series/esp8266/libraries/" is empty
error compiling...
fatal: No url found for submodule path '../esp8266/libraries/ESP8266SdFat' in .gitmodules
Seems your problem is because you didn't install the framework correctly.
Please refer to this document: https://docs.heltec.cn/#/en/user_manual/how_to_install_esp8266_Arduino