getting a weird error when I try to build project on droplet

On my development environment I would usually run these commands to rebuild my project:

php artisan cache:clear
composer dump-autoload

but when I try running them on my droplet I get some weird errors:

PHP Fatal error:  Uncaught Error: Class 'Illuminate\Foundation\Application' not found in /var/www/
Stack trace:
#0 /var/www/ require_once()
#1 {main}
  thrown in /var/www/ on line 14
Cannot create cache directory /home/francis/.cache/composer/repo/, or directory is not writable. Proceeding without cache
Cannot create cache directory /home/francis/.cache/composer/files/, or directory is not writable. Proceeding without cache
Generating autoload files

Anyone have any idea’s whats going on? Also, I can’t seem to get gulp to work on my ubuntu machine. Says gulp is not a command

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Old Question, but ran into this problem. Fixed by doing this:

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

then restart the server.

Source: SO

ran a few commands:

sudo apt-get install php-xml
sudo apt-get install php-mbstring

was able to get my composer install to work. Laravel is finally running but it’s running into problems lol. I’m guessing it’s a problem with the directories now

Your environment isn’t configured correctly. You probably need to remove the contents of vendor/ from your version control and run composer install on your droplet.