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I would like to point out that in the last week I have encountered, more and more often, an error while accessing the home page of the site.
Clearing cookies or changing browsers does not solve the problem.
The problem looks the same way with Chrome, Firefox, Opera and Edge.

This work for me tries it Go to the app directory then to boot directory you will see production.php file.
That is: 

Code:

app => Config => Boot => production.php

Change the 

Code:

ini_set('display_errors', '0')

 to 

Code:

ini_set('display_errors', '1')

.
Warning: When in production change back to initial 

Code:

ini_set('display_errors', '0')

Or
you can rename your file 

Code:

env

 in your project directory to 

Code:

.env

 after that open it and edit. Search for 

Code:

# CI_ENVIRONMENT = production

 remove 

Code:

#

 and change 

Code:

production

 to 

Code:

development