Getting Errors In Source files of FirebaseArduino.cpp and FirebaseHttpClient_Esp8266.cpp while verifying Code.

[usamaalpp]

Whenever I try to run my code I get this Error. I searched a lot about this error but all in vain.
Here is the error:
Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'String FirebaseArduino::push(const String&, const ArduinoJson::JsonVariant&)':
Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:65:54: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
65 | int status = req_.get()->sendRequest(host_, auth_, "POST", path.c_str(), buf);
| ^~~~~~
Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'void FirebaseArduino::set(const String&, const ArduinoJson::JsonVariant&)':
Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:94:41: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
94 | req_.get()->sendRequest(host_, auth_, "PUT", path.c_str(), buf);
| ^~~~~
Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'void FirebaseArduino::getRequest(const String&)':
Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:101:41: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
101 | req_.get()->sendRequest(host_, auth_, "GET", path.c_str());
| ^~~~~
Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp: In member function 'virtual void FirebaseArduino::remove(const String&)':
Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp:147:41: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
147 | req_.get()->sendRequest(host_, auth_, "DELETE", path.c_str());
| ^~~~~~~~
Arduino\libraries\firebase-arduino-master\src\Firebase.cpp: In member function 'int FirebaseRequest::sendRequest(const string&, const string&, char*, const string&, const string&)':
Arduino\libraries\firebase-arduino-master\src\Firebase.cpp:78:1: error: no return statement in function returning non-void [-Werror=return-type]
78 | }
| ^
Arduino\libraries\firebase-arduino-master\src\Firebase.cpp: In member function 'void FirebaseStream::startStreaming(const string&, const string&, const string&)':
Arduino\libraries\firebase-arduino-master\src\Firebase.cpp:91:16: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
91 | analyzeError("STREAM", status, path_with_auth);
| ^~~~~~~~
Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp: In member function 'virtual void FirebaseHttpClientEsp8266::begin(const string&)':
Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:47:50: error: no matching function for call to 'begin(const char*, const char [60])'
47 | http_.begin(url.c_str(), kFirebaseFingerprint);
| ^
In file included from Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:9:
AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:166:10: note: candidate: 'bool HTTPClient::begin(String, uint16_t, String)' (near match)
166 | bool begin(String host, uint16_t port, String uri = "/") attribute ((error("obsolete API, use ::begin(WiFiClient, host, port, uri)")));
| ^~~~~
AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:166:10: note: conversion of argument 2 would be ill-formed:
Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:47:30: error: invalid conversion from 'const char*' to 'uint16_t' {aka 'short unsigned int'} [-fpermissive]
47 | http_.begin(url.c_str(), kFirebaseFingerprint);
| ^~~~~~~~~~~~~~~~~~~~
| |
| const char*
In file included from Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:9:
AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:167:10: note: candidate: 'bool HTTPClient::begin(String, const uint8_t*)' (near match)
167 | bool begin(String url, const uint8_t httpsFingerprint[20]) attribute ((error("obsolete API, use ::begin(WiFiClientSecure, ...)")));
| ^~~~~
AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:167:10: note: conversion of argument 2 would be ill-formed:
c:\Users\dell\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:47:30: error: invalid conversion from 'const char*' to 'const uint8_t*' {aka 'const unsigned char*'} [-fpermissive]
47 | http_.begin(url.c_str(), kFirebaseFingerprint);
| ^~~~~~~~~~~~~~~~~~~~
| |
| const char*
Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp: In member function 'virtual void FirebaseHttpClientEsp8266::begin(const string&, const string&)':
Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:51:60: error: invalid conversion from 'const char*' to 'const uint8_t*' {aka 'const unsigned char*'} [-fpermissive]
51 | http_.begin(host.c_str(), kFirebasePort, path.c_str(), kFirebaseFingerprint);
| ^~~~~~~~~~~~~~~~~~~~
| |
| const char*
In file included from Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp:9:
C:\Users\dell\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.0\libraries\ESP8266HTTPClient\src/ESP8266HTTPClient.h:168:70: note: initializing argument 4 of 'bool HTTPClient::begin(String, uint16_t, String, const uint8_t*)'
168 | bool begin(String host, uint16_t port, String uri, const uint8_t httpsFingerprint[20]) attribute ((error("obsolete API, use ::begin(WiFiClientSecure, ...)")));
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
cc1plus.exe: some warnings being treated as errors

Is there any solution for it? I have tried my best but this error is not sorting.

[Anshul-13J]

Got any solution yet?

[nmktad]

I need solutions asap

[gowthamoo3]

me too getting the same

[jameysu]

To solve this problem, try to downgrade your esp3266 board from latest to 2.7.4.

[TrickSumo]

In case anyone face same problem in future, downgrading ESP8266 board and ArduinoJSON library is only option as of now (September 2023).
Steps to do same:- https://www.youtube.com/watch?v=m3Xb9GB9SI8

[coderkage]

Thanks! It was very helpful.