Failed to load development version error in Lightroom for mobile

Can someone please tell me how to fix this problem? I can't see any photos  except for the four photos that I imported earlier, but when I export the unseen pictures (2nd pic) it says that "it couldn't complete export", and another thing, when I try to open the unseen photos, it says "failed to load development version", can anyone help me solve this error/problem?!?

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