Whoops, looks like something went wrong. Is a generic error and is shown whenever there is any issue. You can see more detailed information by opening application/.env file and changing this line:

APP_DEBUG=false

to

APP_DEBUG=true

 This will give you full error stracktrace that should help you better determine what is the cause for the error.

Important:
Make sure to set debug back to false afterwards as it might expose some private information, if your site is online.