Upgrading Drupal

Just updated from 8.3.7 to 8.4.4. 

Everything went fine except that at the end got this error. 

Hello,

I ran the composer command below:

composer update drupal/core --with-dependencies

Then, I got this error:

When I started I had Drupal 8.1.7 installed and tried to update to 8.4.3 but a 500 error.  So I restored my site back and update to the next incremental minor Drupal security updates up to 8.3.1 where I notice things were not looking right.  My last stable update is 8.2.8 and when updating to 8.3.1 using update.php through the GUI I got a message that referenced serialization and gave me this link https://www.drupal.org/node/2837696.

Hello , maybe anyone can help me ?

with update to 8,4 i got problem with fatal errors in continent no possible  create , so  upgrade to 8.5  with continent all ok , but now cant access to configuration and reports .

this getting if trying go in configuration or reports :

The website encountered an unexpected error. Please try again later.

please tell me how i can solve that 

I recently learned, with the help of this forum, how to upgrade my vendor and core files using Composer. It's starting to click more each time I use it, but there was certainly a steep learning curve.

I ran $ composer outdated and found the following:

Friends of Drupal.

I'm a novice in this, and even though I'm not young. I want to face this challenge, of course, I need help.

My server is godaddy and the drupal installation was automatic from there. Installatron was used. I did not have to configure the database. The database was created and configured automatically.

The case is that Drupal 8.1.7 was installed and now it appears to me that I must update to 8.4.3.