Error when configuring the Adobe Acrobat

Hello I am trying to configure the Adobe Acrobat but at the time of processing it I have been encountered with an error as the document had saved but it cannot be converted to the PDF/A and to identify these document properties which prevent it from being complaint to the profile I have used.
Kindly provide me the solution as it will be a great help.
Thank you.

Error:
The document has been saved,however,it could not be converted according to the selected standard profile:Convert to PDF/A"in order to identify those properties of the document which prevent it from bing compliant to this profile.
