PsychoPy Keeps Crashing after adding loops

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OS (e.g. Win10): Win10
PsychoPy version (e.g. 1.84.x): v3.0.0b12
Standard Standalone? (y/n) If not then what?:yes
**What are you trying to achieve?: Psychopy experiment keeps crashing when I try to run it. I have 4 blocks of 55 trials each and I’m trying to run through to see if the program can open all the stimuli files correctly, but the program keeps freezing mid-loop and PsychoPy stops responding.

I currently have my stimuli images named with a numerical character starting (i.e. 1_Agency_reduced) which I know from tutorial videos may cause some issues. I also don’t have my image names ending in .png but a shorter block of trials ran the files correctly even though they don’t have the .png ending. Could the naming of my files be causing this issue?

When I open my experiment I get a bunch of messages in Coder mode that says that certain parameters are not known the this version of PsychoPy but has come from my experiment file, but I coded the entire experiment on the same computer in the same version.

Please help!