PG blank page on XAMPP

I have named the folder of PowerGallery101 as ‘PowerGallery’. This folder is in the main root of my site i.e. where is and the home –index- page of my site. I run the site in XAMPP on my PC.
I run the Power Gallery using the url: PowerGallery/.
Fistly opens the administrator password page which has the url: index.php.

After the login, opens the page choosegallery.php,
where I have already created the Gallery 1, which has been created during the first running of the PG.
In the first installation I have followed the given steps, where it has been created this Gallery 1, using the images which are under the folder C:\xampp\htdocs\mysitename\PowerGallery\install\samples

When I go to the Manage Images
‘manageimages.php ‘,
I see all the Images which have to be included in the Gallery 1. The PG has created a folder named ‘1’ in this address: C:\xampp\htdocs\mysitename\PowerGallery\images
When I continue to the next step ‘Choose Design’ choosedesign.php
and I try preview -doesn’t matter which design- then I get a blank page. Let me say that I choose the design Grid+Fullsize then the browser get the url: index.php?gallery=1&theme=dark, but I get a blank page.
I went to the next step ‘Add to Site’ and I tried to run the url: index.php?gallery=1&theme=dark
and I have the same behavior.

Till now I didn’t include the PG inside any page of my site because I see that is not running, that’s why I didn’t include any error code in my page. I have seen similar instructions in another thread but I thought that there is no reason to include the PG in my site as the basic url index.php?gallery=1&theme=dark
doesn’t run.
The error I get is:
Fatal error: Maximum execution time of 60 seconds exceeded in C:\xampp\htdocs\mysitename\PowerGallery\mediarss.php on line 7

I have checked and I show that this folder ‘1’, exist also in the following address: C:\xampp\htdocs\mysitename\PowerGallery\galleries\grid_fullsize\1
Inside this folder there are the images of the Gallery 1.

Thank you very much for your help
Spyros