Typically this error arises if you do not have a full version of Adobe Acrobat DC installed. As mentioned in the system requirements, the PDF Manipulator DC requires Adobe Acrobat DC Standard or Professional to create form fields in a PDF. Please note, Adobe Acrobat Reader DC is not a full version of Adobe Acrobat DC. Please verify that you have a full version of Adobe Acrobat DC installed on your machine and try again.