Error:Your requirements could not be resolved to an installable set of packages.(on server)

Question

I am using laravel 5.3 for my project.Now I am setting it up to the server.

The problem occured when doing so.And i am stuck at this point of error.

WHEN I run

composer install --no-dev

command following error occurs:

 Problem 1
    - Installation request for fgrosse/phpasn1 1.5.2 -> satisfiable by fgrosse/phpasn1[1.5.2].
    - fgrosse/phpasn1 1.5.2 requires ext-gmp * -> the requested PHP extension gmp is missing from your system.
  Problem 2
    - Installation request for mdanter/ecc v0.4.2 -> satisfiable by mdanter/ecc[v0.4.2].
    - mdanter/ecc v0.4.2 requires ext-gmp * -> the requested PHP extension gmp is missing from your system.
  Problem 3
    - Installation request for pusher/pusher-php-server 2.6.3 -> satisfiable by pusher/pusher-php-server[2.6.3].
    - pusher/pusher-php-server 2.6.3 requires ext-curl * -> the requested PHP extension curl is missing from your system.
  Problem 4
    - pusher/pusher-php-server 2.6.3 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - laravel-notification-channels/pusher-push-notifications 1.0.2 requires pusher/pusher-php-server 2.6.* -> satisfiable by pusher/pusher-php-server[2.6.3].
    - Installation request for laravel-notification-channels/pusher-push-notifications 1.0.2 -> satisfiable by laravel-notification-channels/pusher-push-notifications[1.0.2].

  To enable extensions, verify that they are enabled in your .ini files:
    - /etc/php/7.0/cli/php.ini
    - /etc/php/7.0/cli/conf.d/10-mysqlnd.ini
    - /etc/php/7.0/cli/conf.d/10-opcache.ini
    - /etc/php/7.0/cli/conf.d/10-pdo.ini
    - /etc/php/7.0/cli/conf.d/20-calendar.ini
    - /etc/php/7.0/cli/conf.d/20-ctype.ini
    - /etc/php/7.0/cli/conf.d/20-exif.ini
    - /etc/php/7.0/cli/conf.d/20-fileinfo.ini
    - /etc/php/7.0/cli/conf.d/20-ftp.ini
    - /etc/php/7.0/cli/conf.d/20-gettext.ini
    - /etc/php/7.0/cli/conf.d/20-iconv.ini
    - /etc/php/7.0/cli/conf.d/20-json.ini
    - /etc/php/7.0/cli/conf.d/20-mbstring.ini
    - /etc/php/7.0/cli/conf.d/20-mysqli.ini
    - /etc/php/7.0/cli/conf.d/20-pdo_mysql.ini
    - /etc/php/7.0/cli/conf.d/20-phar.ini
    - /etc/php/7.0/cli/conf.d/20-posix.ini
    - /etc/php/7.0/cli/conf.d/20-readline.ini
    - /etc/php/7.0/cli/conf.d/20-shmop.ini
    - /etc/php/7.0/cli/conf.d/20-sockets.ini
    - /etc/php/7.0/cli/conf.d/20-sysvmsg.ini
    - /etc/php/7.0/cli/conf.d/20-sysvsem.ini
    - /etc/php/7.0/cli/conf.d/20-sysvshm.ini
    - /etc/php/7.0/cli/conf.d/20-tokenizer.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

`

Answer 1

Your PHP need some ext for run your packages.

You can install that with apt-get if you use Ubuntu and PHP 5 :

apt-get install php5-gmp 
apt-get install php5-curl

If you use PHP 7:

apt-get install php7.0-gmp 
apt-get install php-curl

and etc...

After that restart your web service then it will work.