Greetings, Noctisx3. I am not associated with the game developer, nor the rest of their team, but it is my pleasure to offer you some assistance.
It is possible that this error occurred due to where you extracted/placed the 'images.rpa' file.
If this is the case, try extracting/moving it into the sub-folder titled 'game'. I will leave you a couple of screenshots for reference. Hopefully if the issue was not resolved previously, this might aid you.
3 years ago(+1)
Thank you,
Somehow the problem lied within the images.rpa file. .I redownloaded it and now its works.