Trying to send simple json to backend (backend works) in android studio

[west kettle]

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[frozen nimbus]

Developing app for uni coursework and trying to send json to a backend via https, not done this before in java but have in c++.
Using gson to convert data to json. And then trying to send the data using inbuilt java http function. The app just keeps crashing when i click on the sign in button on the application(On the emulator). No errors in code but errors in logcat (in the file) edit: didnt mean to add to the document