As per the description mentioned above, you are getting error message when trying to sign a from, is that correct?
Try filling the form by opening in Acrobat Reader and see if that works.
Visit the following link to download Acrobat Reader on your computer: Adobe - Adobe Acrobat Reader DC Distribution
Let us know how it goes.
I downloaded the form from this official site
Opened it in Acrobat and was still unable to sign it ...am I able to send screenshots of the error message in this forum?
You can attach images using the Camera icon.
What happens, exactly, when you attempt to sign the form?
What application, including exact version number, are you using to open it?
Also, there are hundreds of forms on that page. Please provide the direct link to the one you're referring to.
I apologize but the direct link to the form I was trying to sign http://www.apd.army.mil/pub/eforms/DR_a/pdf/A31.pdf
The version I am working with is
2017 Release|Version 2017.009.20044
I tried to open the link but its showing error. You may refer to the steps suggested in the following link: