Unable to load stimuli

I am unable to run an experiment due to an inability to load stimuli files. Pictures (JPGs) were inserted into individual events, and all appear to be in the experiment. That is they are all available for preview. Oddly, I tested the first 36 events and they worked properly, before continuing to do the others. However, now when I click run I get 2 to 3 random file errors that describe the path to find the image followed by a “unable to open stimulus file” for a single stimuli.

I’m stuck and any feedback would be helpful. Thanks in advance