In both cases, Force Re-Check, then starting the torrent will fix this.

force reannounce, force recheck and if none work delete it and start fresh

Invalid state:

• Interrupted Download: The download process might have been interrupted unexpectedly (e.g., due to a power outage, system crash, or network disconnection). This can leave the downloaded files in an incomplete or corrupted state.

• File Movement or Renaming: If you've moved or renamed the downloaded files or the download folder outside of the torrent client, the software can lose track of them, leading to this error.
  Disk Errors: Problems with your hard drive can cause data corruption, resulting in an invalid download state.

• Incompatible Software: In rare cases, other software interfering with the torrent client's access to the files can cause this issue.

• Client Restart: Sometimes, the error appears after restarting the torrent client, indicating that it couldn't properly resume the previous state.

• Network Issues: Intermittent network problems could disrupt the download and lead to an inconsistent state.

Invalid Data:

• list itemCorrupted Download: Pieces of the file might have been downloaded incorrectly due to network issues, peer problems, or interruptions.
  Disk Errors: As mentioned before, hard drive problems can lead to data corruption after it has been downloaded.

• Incomplete Download: The error might appear if the download is significantly incomplete.
  Problems with Part Files: Torrent clients often use temporary "part files" during the download process. Errors with these files can sometimes lead to "data is invalid" messages.

• Skipping Files During Download: If you chose to skip certain files within a torrent, it can sometimes cause issues with the integrity of the downloaded parts of the other files.

• Corrupted Torrent File: Although less common, a corrupted torrent file could provide incorrect data for verification.