问题:

I installed Laravel without using composer with typing this command:

C:\wamp\www\travail>laravel new project

It seems that it is on the good way.

Creating application...

Application ready! Build something amazing.

But when I tried to open my project here:

wamp-->localhost-->travail-->project-->public

I got this error:

Class 'Monolog\Logger' not found

回答1:

I solve this issue by doing the following:

Check the minimum-stability value in composer.json and set it to stable:
```
"minimum-stability": "stable"
```
Update you composer:
```
composer self-update
```
Re-run composer udpate:
```
composer update
```

Then run any artisan commands and enjoy coding!

According to this thread. Change minimum-stability from dev to stable in composer.json, then run an update. Also try to do a dump-autoload.

Finally it works for me after running these two commands:

composer self-update

Then:

composer update --no-scripts