Here is what could be causing this error message:
1. Is your information in the correct format
Check out our help center article for more information
2. Do your column headers match ours?
Your census will not upload with different or additional column headers!
2. Are you using the right template?
3. Is your census a ".csv" (comma separated values)?
Did you export your file as a ".CSV" (comma separated values)? Follow these steps to export as the correct format.
4. Does your template have a formatting issue?
Here is our help center article to correct it.