uninitialized constant DeviseTokenAuth::Concerns::User::BCrypt - ruby-on-rails

Using the devise_token_auth gem, I am making a rails-based API in which I am trying to reset my password using email.
On opening the email with reset link, I get this Error:
uninitialized constant DeviseTokenAuth::Concerns::User::BCrypt
The code points to Api::V1::Overrides::PasswordsController#edit
tokens[client_id] = {
token: BCrypt::Password.create(token),
expiry: expiry
}.merge!(token_extras)
What can I do to make my reset link to go onto my reset form?
I am following this for PasswordsController action
Tried checking github but there no one actually has faced this sort of error and I cannot rectify it.
P.S. I am not an experienced Ruby developer.

Probably just missing the bcrypt gem, e.g. add this in your Gemfile:
gem 'bcryt`

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You are probably getting a "Can't verify CSRF token authenticity" error. Can you check your server logs?
In your ApplicationController please add the following and check if you get an error.
protect_from_forgery with: :exception

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I'm pretty new to rails and I'm beginning with rails-api.
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Thank you guys
This is due to the forgery protection enabled by default by rails.
If you're working on an API only, my guess is that you can simply turned it off in the environment file (test/developpement/production.rb) by adding this line :
config.action_controller.allow_forgery_protection = false
Cheers.
It's an incompatibility with rails-api and doorkeeper.
My project are being started and based on this and other things, I've chose grape instead of rails-api. It works for me!
If you can do this, I can't help you now!
tip: Enjoy with grape!

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I have a rails app using omniauth for user authentication with facebook. twitter and google. I've add one more provider StockTwits, with gem omniauth-stocktwits. And now my application cant' start because of error:
/home/vladimir/.rvm/gems/ruby-1.8.7-p371#ea/gems/aws-s3-0.6.2/lib/aws/s3/extensions.rb:206:in `const_missing': uninitialized constant OmniAuth::Strategies::Stocktwits (NameError)
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The constant should be StockTwits, not Stocktwits. Are you calling it without the capital T anywhere?
Otherwise could you give me more information on how you're requiring and initializing omniauth-stocktwits, and what the rest of the stack trace from your error looks like, so I can try reproducing it?
Also Google is showing a lot of unrelated const_missing errors bubbling up through the AWS-S3 gem, so it's possible this is completely unrelated to AWS.

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http://railsforum.com/viewtopic.php?id=23151
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Update: Ooh, got further; I followed this post: open_id_authentication - "OpenIdAuthentication.store is nil. Using in-memory store." problem
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I would suggest trying the latest version of the plugin, or the gem.
Things change quick in rails, and old code can break with new versions of rails.
I would suggest trying Devise, it is easier for integrate OpenId, Facebook, Tweeter ...
https://github.com/plataformatec/devise

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