Dialog throwing "Unable to add window — token null is not for an application” Error

This is a common problem, you can not reach the context first and therefore it is null. What you need to do here is that if you use "ActivityName.this" instead of getApplicationContext(),context etc. your problem will be resolved.

Like this;
 

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Rake Migration Error

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That's error like that. rails aborted ! StandardError: An error has occurred, this and all later migrations canceled: Directly inheriting from ActiveRecord::Migration is not supported. Please specify the Rails release the migration was written for: class CreateFriendlyIdSlugs < ActiveRecord::Migration[4.2]  That problem due to rails version. So all you need to do, enter db>migrate folder and opened YOURDATE_create_friendly_id_slugs.rb file. Then add extend class name [5.1].       class CreateFriendlyIdSlugs < ActiveRecord :: Migration [ 5.1 ] def change create_table :friendly_id_slugs do | t | t . string :slug , :null => false t . integer :sluggable_id , :null => false t . string :sluggable_type , :limit => 50 t . string :scope t .datetime :created_at end add_index :friendly_id_slugs , :sluggable_id ...
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