Can't erase on vector<cobalt::promise<void>>

I'm using a vector or a deque to wait for my promises to complete.

`std::deque> session_promisses;`

When I try to erase,

`session_promisses.erase(session_promisses.begin() + session_index);`

I get the following error:

use of deleted function ‘boost::cobalt::detail::promise_receiver& boost::cobalt::detail::promise_receiver::operator=(const boost::cobalt::detail::promise_receiver&)’
[build] 92 | receiver_ = std::move(lhs.receiver_);