Tweety | Simple Android Twitter application

This question is about the preferred way to retrieve grouped data from a database to an application. I have a schema with tables in a 1:n relationship. For example let's say it's owner:pet:

I try to clean some twitter data stored in a csv file using python in jupyter notebook, so I try this code:

Here is my line 51,

On logging in, This error pops up.

Fatal error: Uncaught Error: Call to a member function prepare() on null in C:\xampp\htdocs\twitter\core\classes\user.php:19 Stack trace: #0 C:\xampp\htdocs\twitter\includes\login.php(17): User->login('user@email.com', 'passwordofuser') #1 C:\xampp\htdocs\twitter\index.php(59): include('C:\xampp\htdocs...') #2 {main} thrown in C:\xampp\htdocs\twitter\core\classes\user.php on line 19

I'm a beginner in PHP and was trying to validate the "entered" email and password by connecting it to SQL DATABASE. I wanted to display an "error" message if the email or password is not available in database. This is user.php.
The error is at line 19.

I am facing problem regarding permission

Argument 1 passed to App\Providers\AuthServiceProvider::App\Providers{closure}() must be an instance of App\Providers\User, instance of App\User given, called in C:\xampp\htdocs\Tweety\vendor\laravel\framework\src\Illuminate\Auth\Access\Gate.php on line 473 (View: C:\xampp\htdocs\Tweety\resources\views\tweet.blade.php)

I am just working to show delete button only on those tweets made by the authenticated users

my controller

I'm following a tutorial from Laracasts and I'm making a clone of Twitter. I've got a home.blade.php and a HomeController.php file. In the HomeController I've got a function called index, which calls the home view. He also sends a variable called "tweets".

I have trained a NaiveBaynes classifier using the twitter_sample corpus. I was able to test the classifier on one tweet in order to ensure it works. However, I am trying to now loop the classifier through a list of ~4000 tweets and am getting an AttributeError on my code:

I'm getting this error.

ValueError: Error when checking input: expected input_1 to have 3 dimensions, but got array with shape (860, 11)

These are the below codes that I'm using. The df has 860x15 dimension so datX has 860x11 dimension

I'm trying to retrieve my documents from mongo db.

I make an ajax get request to my node server and the server is supposed to find the documents according to the "breed" variable, put it in a list and send it back to the client.

Then in the success part of ajax, I'm to populate a listview with the list.

The problem is that the find() functions returns null I believe even though I have one document in my collection that satisfies the condition.

Here is how I'm retrieving the documents: