Hi Maserati,
I have tried the RemoveTask method and it works as intended, also as Peter shared a code example which also demonstrates this method.
Maybe if you share a bit more context/code example then we will be able to evaluate your issue and be able to assist you.
Please, do not hesitate to contact us if you have any additional questions.
Best regards,
Yavor Dashev
Smart UI Team
https://www.htmlelements.com/