Jessie

Hi all, I'm a beginner, and just finishing the first site with PW. I installed PW master to my site, however when I tried to add image filed, it shows me the fatal error message as shown in the screenshot attached. I installed PW as how it was downloaded via FTP. Could someone tell me what this error message means, and do I actually need to edit the php files in wire folder? Thanks in advance!

Hi all, I'm a beginning, and just finishing the first site with PW. I installed PW master to my site, however when I tried to add image filed, it shows me the fatal error message as shown in the screenshot attached. I installed PW as how it was downloaded via FTP. Could someone tell me what this error message means, and do I actually need to edit the php files in wire folder?