incomplete type std::string for strings used in library (_host , _CaCert )

[AashayaDesigns]

C:\Users\User\Documents\Arduino\libraries\arduino_107156\src/wcs/esp8266/FB_HTTPClient.h:109:15: error: field '_host' has incomplete type 'std::string' {aka 'std::__cxx11::basic_string'}
109 | std::string _host = "";

Error when compiling the files itself.

To Reproduce
Steps to reproduce the behavior:

1. Update to arduino core 3.0.0
2. Open any example from library
3. Compile

Expected behavior
Was compiling flawlessly previously in Arduino core 2.7.4

IDE and its version:

• Arduino, 1.8.14

ESP8266 Arduino Core SDK version

• 3.0.0

[mobizt]

This is due to the GCC 10 compiler error used in ESP8266 Arduino Core SDK 3.0.0 which you're using.

The library updated to v2.2.0 to support this new SDK.

Please update.

Please read this as it affected to your free memory.