My error log keeps getting filled up with this message (changed my real domain with "mydomain"):

App Error: AbanteCart core v.1.2.7 Error: Cannot get image size of file /home/mydomain/public_html/store/resources/. File not found or it's not an image! in /home/mydomain/public_html/store/core/helper/utils.php on line 1116

I read previous posts about this that said to change the permissions of the files and folders of images.  But no posts stated what the correct permissions were.  Right now, the resources/downloads and resources/images are all set to 755.

What am I missing here?  BTW, I am not well-versed in code.  Thanks for any assistance.

Total newbie here.  I don't know html.  One of a hundred questions I have in setting up my store is this:

I have added downloadable products and have set up my home page.  I have one parent category "Books".  Two sub-directories.  When I view the pages, they come up perfectly.  But when I view the home page, then click on "Books", I get Page Not Found 404.

I apologize for not being very tech savvy, but I'm going slightly crazy with the store setup.