Hi,
I am using Delta theme and today I installed the "Make Offer plugin" and it gives me the following errors.

1 - All photos disappeared.
2 - When I place the code <?php myo_show(); ?> in the file item.php the page breaks and shows the following error:

Fatal error: C:\xampp_7_4_33\htdocs\osclass1\oc-content\plugins\osclass-make-your-offer-master\classes\myo.class.php on line 63.

Picture attached.

I do not recognize plugin path and function names so I think you downloaded it from somewhere (github?).
Anyway having "master" in folder name will probably be wrong.