That usually happens when one of the split files is incomplete or the extraction software isn't handling the archive correctly.
Could you tell me:
- What extraction program are you using? (7-Zip, WinRAR, etc.)
- What's the exact error message?
Also, make sure both parts are in the same folder before extracting, and start the extraction from **Part 1** (or the `.zip`/`.7z.001` file, depending on the archive format), not Part 2.
Once you tell me the error message, I'll do my best to help you figure it out.