Check the logs (right-click profile > View Log, in English).
Errors at the file-level (if you are using HMTL logging) will be on a separate log page/s, accessed by clicking the Errors link next to any error-count on page-1 of the log (the page that opens first).
Errors at the profile-level (e.g. Scan Failure) will be on page-1 itself.
If there are any Non-critical Errors listed (the link to it is 'live', with a number shown), check them too (they can explain why certain file-level error entries such as 'Skipped' are occurring)
Errors at the file-level (if you are using HMTL logging) will be on a separate log page/s, accessed by clicking the Errors link next to any error-count on page-1 of the log (the page that opens first).
Errors at the profile-level (e.g. Scan Failure) will be on page-1 itself.
If there are any Non-critical Errors listed (the link to it is 'live', with a number shown), check them too (they can explain why certain file-level error entries such as 'Skipped' are occurring)