Laravel composer autoload/ guzzlehttp : fatal error - laravel-5

When deploying my Laravel website (1&1 mutualized), this is the fatal error I get:
Fatal error: require(): Failed opening required '/homepages/41/d623699018/htdocs/athyr/athyr - copie/athyrcopie/vendor/composer/../guzzlehttp/psr7/src/functions_include.php' (include_path='.:/usr/lib/php7.0') in /homepages/41/d623699018/htdocs/athyr/athyr - copie/athyrcopie/vendor/composer/autoload_real.php on line 66
I already tried composer update & composer dump_autoload. And I checked that it's PHP 7 everywhere.

Have you tried:
php artisan optimize

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PHP Fatal error: Interface 'JsonSerializable' not found when i upload it to cpanel

PHP Fatal error: Interface 'JsonSerializable' not found in /home/peoplesi/public_html/core/vendor/laravel/framework/src/Illuminate/Support/Collection.php on line 40
i get this error when i upload it to cpanel
My php version is 7
i also tried composer update many time
Can anyone kindly give me a solution to remove this error

When I run composer update I get a fatal error

When I run composer update I get the following error:
PHP Fatal error: Interface 'Symfony\Component\Console\Formatter\WrappableOutputFormatterInterface' not found in /var/www/html/danceGitHub/dance/vendor/symfony/console/Formatter/OutputFormatter.php on line 22

How to install Laravel v5.2.15 when I have already installed v5.6.12?

I am trying to install a lower version of laravel when I have already installed a higher version in my htdocs. But it throws an error.
C:\xampp\htdocs\laravel-6>composer create-project laravel/laravel=5.2.15 s6
Installing laravel/laravel (v5.2.15)
- Installing laravel/laravel (v5.2.15): Loading from cache
Created project in s6
> php -r "copy('.env.example', '.env');"
> php artisan clear-compiled
PHP Warning: require(C:\xampp\htdocs\laravel-6\s6\bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in C:\xampp\htdocs\laravel-6\s6\bootstrap\autoload.php on line 17
PHP Stack trace:
PHP 1. {main}() C:\xampp\htdocs\laravel-6\s6\artisan:0
PHP 2. require() C:\xampp\htdocs\laravel-6\s6\artisan:16
PHP Fatal error: require(): Failed opening required 'C:\xampp\htdocs\laravel-6\s6\bootstrap/../vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\laravel-6\s6\bootstrap\autoload.php on line 17
PHP Stack trace:
PHP 1. {main}() C:\xampp\htdocs\laravel-6\s6\artisan:0
PHP 2. require() C:\xampp\htdocs\laravel-6\s6\artisan:16
Warning: require(C:\xampp\htdocs\laravel-6\s6\bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in C:\xampp\htdocs\laravel-6\s6\bootstrap\autoload.php on line 17
Call Stack:
0.0007 344912 1. {main}() C:\xampp\htdocs\laravel-6\s6\artisan:0
0.0016 346488 2. require('C:\xampp\htdocs\laravel-6\s6\bootstrap\autoload.php') C:\xampp\htdocs\laravel-6\s6\artisan:16
Fatal error: require(): Failed opening required 'C:\xampp\htdocs\laravel-6\s6\bootstrap/../vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\laravel-6\s6\bootstrap\autoload.php on line 17
Call Stack:
0.0007 344912 1. {main}() C:\xampp\htdocs\laravel-6\s6\artisan:0
0.0016 346488 2. require('C:\xampp\htdocs\laravel-6\s6\bootstrap\autoload.php') C:\xampp\htdocs\laravel-6\s6\artisan:16
Script php artisan clear-compiled handling the pre-update-cmd event returned with error code 255
But when I tried installing laravel v5.6.12, it gets installed easily again. Please tell me a way around to install a lower version of laravel while keeping the higher version. Thanks.
Errors:Updates suggested by a member
I was suggested to download laravel's particular version manually and I did also tried to update composer but still facing problem. The error that has occurred is shown below:
Have you tried using this command to install a clean copy of laravel 5.2.15?
composer create-project --prefer-dist laravel/laravel laravelProjectFolder "5.2.15"

Laravel 5 issue : libraries/admin/ does not exist and could not be created

I'm trying to install laravel from git. I cloned the repository and tried the command
php artisan serve
But It gave this error message.
Warning:
require(C:\wamp64\www\reguard\bootstrap/../vendor/autoload.php):
failed to open stream: No such file or directory in
C:\wamp64\www\reguard\bootstrap\autoload.php on line 17
Fatal error: require(): Failed opening required
'C:\wamp64\www\reguard\bootstrap/../vendor/autoload.php'
(include_path='.;C:\php\pear') in
C:\wamp64\www\reguard\bootstrap\autoload.php on line 17
and I ran a composer install
But it stopped with this error,
[RuntimeException] libraries/admin/ does not exist and could not be
created.
So I ran a composer du as the first comment but now getting this,
[Symfony\Component\Debug\Exception\FatalErrorException] Class
'R2S\Admin\Providers\AdminServiceProvider' not found
Hope someone can help.

Laravel Installer throwing error

I'm getting this error when calling the bash command
laravel new project
php -r "copy('.env.example', '.env');"
php artisan clear-compiled
Warning: require(/Users/Dale/Desktop/Outstanding Projects/project/bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in /Users/Dale/Desktop/Outstanding Projects/project/bootstrap/autoload.php on line 17
Fatal error: require(): Failed opening required '/Users/Dale/Desktop/Outstanding Projects/project/bootstrap/../vendor/autoload.php' (include_path='.:') in /Users/Dale/Desktop/Outstanding Projects/project/bootstrap/autoload.php on line 17
Script php artisan clear-compiled handling the post-install-cmd event returned with an error
Anyone come across this before.
I assume you used composer to install Laravel.
Laravel can't find your autoload.php file in vendor directory. Try composer install and composer dumpautoload. Also check if autoload.php is in directory.
Path to autoload.php should be in bootstrap/autoload.php file, check if path is correct with your system.

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