Meta box not appearing in my custom post type

The last two parameters in add_meta_box() are switched. Look at the code in the tutorial next to yours:

// tutorial code
add_meta_box('wpt_events_location', 'Event Location', 'wpt_events_location', 'events', 'side', 'default');

// your code
add_meta_box( 'linkToArcticle', 'Link to arcticle', 'linkToArcticle', 'arcticles', 'default', 'normal' );

Change it to:

add_meta_box( 'linkToArcticle', 'Link to arcticle', 'linkToArcticle', 'arcticles', 'normal', 'default' );

And it will work

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