Hi, everyone! I try to use KeyboardButtonWebView to build a button

Question

Hi, everyone! I try to use KeyboardButtonWebView to build a button

with webapp
like this

await client.send_message(user_id, 'message text', buttons=[
KeyboardButtonWebView('button text', 'https://fragment.com')
])

but get error:

telethon.errors.rpcerrorlist.ButtonTypeInvalidError: The type of one of the buttons you provided is invalid (caused by SendMessageRequest)

Is there any example how to build messages with such buttons ?