報錯：git remote: [session-f0448081] 404 not found!

在.git資料夾中的config檔案中找到子模組的地址，用瀏覽器打開發現確實沒有對應的子模組倉庫，這個時候只需要把地址gitee.com換成github.com就行了，

最終的替換結果如下：

[core]
	repositoryformatversion = 0
	filemode = false
	bare = false
	logallrefupdates = true
	symlinks = false
	ignorecase = true
[remote "origin"]
	url = https://gitee.com/EspressifSystems/ESP8266_RTOS_SDK.git
	fetch = +refs/heads/*:refs/remotes/origin/*
[branch "master"]
	remote = origin
	merge = refs/heads/master
[submodule "components/json/cJSON"]
	active = true
	url = https://gitee.com/DaveGamble/cJSON.git
[submodule "components/lwip/lwip"]
	active = true
	url = https://github.com/espressif/esp-lwip.git
[submodule "components/coap/libcoap"]
	active = true
	url = https://github.com/obgm/libcoap.git
[submodule "components/mbedtls/mbedtls"]
	active = true
	url = https://github.com/espressif/mbedtls.git
[submodule "components/mqtt/esp-mqtt"]
	active = true
	url = https://github.com/espressif/esp-mqtt.git