Difficulty putting experiment on pavlovia

URL of experiment: Visualstimuliverbalisability_legacy [PsychoPy]

I am facing difficulties running my experiment on pavlovia as keep facing the following error :Unfortunately we encountered the following error:

when setting the image of ImageStim: Firstcomp
when getting the value of resource: .\ConvertedImages1\51.png
unknown resource

Try to run the experiment again. If the error persists, contact the experiment designer.

PS:I am not well acqainted with pavlovia.
linesverba-master.zip (2.6 MB)

Try changing the \ symbols to /

Have you attached the images via Experiment Settings / Online / Additional Resources ?

Thank you very much for your fast response .After changing the image format and the slash directions I no longer get that error .However I am guetting a * TypeError: Next1.setFlip is not a function typeerror .I am currently on the lookout for olutions .
Again , a milllion thanks for the help .

Is Next1.setFlip in your custom code?

If not, does Next1 have more than one meaning (e.g. a variable and a component)?

I have disabled all code components before running it and I still encounter the same error .As for the naming , I have tried changing it and still encounter the same error .Just to try , I have disabled those specific text components and the experiment ran perfectly .
PS:Same error is raised when NEXT2 and NEXT3 are being processed but not the instruction text component or any other expet from these 3 .