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My first idea is "Use the [Ask a Question] button on the plugins page".
My second thought is "Why is he asking me instead of the plugin author?"
Both are not helpful for you, I know.
My thoughts about the task are:
1. This is absolutely doable. "Karma" is just a number in the database.
2. If the Karma overview is extendable, it would be best to simply add a [Transfer Karma] button to that screen
3. If the view is not extendable, maybe a module would be a good idea
4. The Author Selector plugin is an example for how to implement a user picking dialog
5. Such a plugin should have an Activity
But if "do you have an idea" means "can you do it for me", I'm sorry I have to say "no". Although I really like the Karma Bank plugin a lot and extending it is always a great experience, I don't have time to write any plugin right now. And if I would have the time, I would continue working on one of my unfinished plugins first.
The typical pitfalls while updating are
From your description I would assume you need to delete the contents of the /cache folder (except for the Smarty cache)
The file should look like that:
<?php $Definition['Howdy, Stranger!'] = 'Welcome to the community!'; $Definition['GuestModule.Message'] = "I don't think I have seen you before. If you want to join in on the conversation, click one of these buttons!";
The file needs to start with
"Title" and "Location" are special profile fields. Maybe that is because such fields are commonly available in other forums, I don't know...
In order to use this two fields, you do not need use the profile extender, only two config settings:
$Configuration['Garden']['Profile']['Titles'] = true; and/or
$Configuration['Garden']['Profile']['Titles'] = true;
If any of this fields has a value, it is displayed automatically. If you "add" this field with the profile extender and use the show in profile feature, it is added twice.
"Call to undefined function mb_encode_" is a good hint. Looks like you do not have enabled the PHP mbstring extension, which is a requirement for Vanilla