500 Internal server error

I installed Kanboard, but when I try to open it, I got the following message :

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at [no address given] to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

There is no log… I don’t have any other information.
Thank you for your help