ArduinoJson 6 error

[FancyPants42]

Hi, I encountered this error while compiling the code in Arduino IDE:

C:\Users\Daryl\OneDrive - Nanyang Technological University\Documents\Arduino\libraries\IFTTTMaker\src\IFTTTMaker.cpp:105:11: warning: unknown escape sequence: '/'
105 | DynamicJsonBuffer jsonBuffer;
| ^~~~~~~~~~~~~~~~~~~~~
C:\Users\Daryl\OneDrive - Nanyang Technological University\Documents\Arduino\libraries\IFTTTMaker\src\IFTTTMaker.cpp:105:11: error: DynamicJsonBuffer is a class from ArduinoJson 5. Please see https://arduinojson.org/upgrade to learn how to upgrade your program to ArduinoJson version 6
C:\Users\Daryl\OneDrive - Nanyang Technological University\Documents\Arduino\libraries\IFTTTMaker\src\IFTTTMaker.cpp: In member function 'String IFTTTMaker::sendTriggerEventWithData(String, ArduinoJson::V6214PB2::JsonObject&)':
C:\Users\Daryl\OneDrive - Nanyang Technological University\Documents\Arduino\libraries\IFTTTMaker\src\IFTTTMaker.cpp:76:26: error: 'class ArduinoJson::V6214PB2::JsonObject' has no member named 'measureLength'
76 | int length = payload.measureLength();
| ^~~~~~~~~~~~~
C:\Users\Daryl\OneDrive - Nanyang Technological University\Documents\Arduino\libraries\IFTTTMaker\src\IFTTTMaker.cpp:82:13: error: 'class ArduinoJson::V6214PB2::JsonObject' has no member named 'printTo'
82 | payload.printTo(out);
| ^~~~~~~
C:\Users\Daryl\OneDrive - Nanyang Technological University\Documents\Arduino\libraries\IFTTTMaker\src\IFTTTMaker.cpp: In member function 'bool IFTTTMaker::triggerEvent(String, String, String, String)':
C:\Users\Daryl\OneDrive - Nanyang Technological University\Documents\Arduino\libraries\IFTTTMaker\src\IFTTTMaker.cpp:105:21: error: 'jsonBuffer' was not declared in this scope; did you mean 'JsonBuffer'?
105 | DynamicJsonBuffer jsonBuffer;
| ^~~~~~~~~~
| JsonBuffer

exit status 1

Compilation error: exit status 1

Appreciate any advice, thanks!