Error: Compile Error: Variable does not exist: AsynchronousFutureMethods at line 23 column 9

trigger SetInternalCommentsAsPrivate on CaseComment (before insert, after insert) {

List<Id> privateCaseComment = new List<Id>();

for(Integer i = 0; i < Trigger.size; i++){

    if(Trigger.new[i].CommentBody <> null){
        if(Trigger.isAfter && Trigger.new[i].CommentBody.startsWith('[Recipients:')){
            String sender = Trigger.new[i].CommentBody.substring('[Recipients:'.length(), Trigger.new[i].CommentBody.indexOf(']', '[Recipients:'.length())).trim();
            if(sender.contains('COMPANY_DOMAIN')){
                privateCaseComment.add(Trigger.new[i].Id);
            }
        }else{
            if(Trigger.IsBefore && Trigger.new[i].CommentBody.startsWith('From:')){
                String sender = Trigger.new[i].CommentBody.substring('From:'.length(), Trigger.new[i].CommentBody.indexOf('n', 'From:'.length())).trim();
                Trigger.new[i].IsPublished = !(sender.contains('COMPANY_DOMAIN'));
            }
        }
    }
}

if(privateCaseComment.size()>0){
    AsynchronousFutureMethods.setInternalCommentsAsPrivate(privateCaseComment);
}