2nd installation blocked my website all together – HELP!

Hi,

I had my website all set up and working and installed the same theme onto a sub directory on my website to create a 2nd portfolio page (the theme I was using wouldn’t let me do this in the main theme site).

For example: my website is https://www.angieburgess.com

I installed wordpress again with the same theme under https://www.angieburgess.com/portraits

Now I am unable to log in to my main wordpress site and it has completely disappeared showing error message: Error establishing a database connection

The strange thing is I had installed a 2nd theme onto my site in a subdirectory (angieburgess.com/Gallery) yesterday and it worked fine, infact it is still working… so its not the new pages but installing the same theme again – Can anyone suggest how to fix this problem.

Many thanks in advance!
Angie

P.S. I’m relatively new to WP, so explanations in the simplest language would be much appreciated.