The file decryption key is not valid

No, you wrote this: 模型导出就显示顶点过大, it translated as When exporting the model, it shows that the vertices are too large.
Is it showing in RealityCapture or in other software (because it sound like in RealityCapture for this case)? If in RealityCapture, then can you please share the error’s print screen?
You also mentioned that you provided the application’s reset. Is that right?
Also, is this happening for you when you start this project from the scratch after application reset?