An error has occurred. error is currently unavailable

The most common error in DNN ,
to see the real error you have to run this query in dotnetnuke database.

select top 1 LogProperties from EventLog order by LogCreateDate Desc

Copy and past contant of LogProperties field to see an error.
And don't forget to select dotnetnuke database if you see Invalid object name 'EventLog'.

dotnetnuke-module-creator fast and effective dotnetnuke module creation.