Some images failed during dataset generation

Some images failed during generation
6504 images (44%) failed to generate. The result of this training run may be different from others. We recommend regenerating the version and contact support if the issue persists.

After applying 2X dataset from raw 6504 images of training data if creates 14935 images. But gives me this error message of “images failed during generation”

  1. Is this a real issue?
  2. How to solve this issue?