Bitnami configures the applications and the different components they need to run. Could you please let us know all the changes you made in the installation before receiving that error message? Please note that we use bitnami_wordpress as database name, bn_wordpress as user and a random password during the installation of the application.
Apart from that information, we have a Support Tool that will gather relevant information for us to analyze your configuration and logs. Could you please download and execute it on the machine where the stack is running by following the steps described in the guide below?
How to Run the Bitnami Support Tool
Please note that you need to paste the code outputted by the tool in your reply.