There are recipients who need to sign this document that do not have a signature field assigned to them.

I have a similar issue. I have one generic document that I want to send to multiple people to enter their name, signature and date.

I have prepared it as a form. It has a name field, signature field (Field type is set to signature) and date field, and the participant role is set to anyone. I then 'request e-signature' add the multple email addresses, and get the error that I do not have a signature field assigned when I press send. Even if I change the participants role to 'signer' I get the same error. I defintely used to be able to do this before, but I cannot work out what I am doing wrong. 😞

you place the signature field, right click, edit, and show a field that says assign to: and choose the email of the person who has to sign there.

After you assign the full name field, click the little icon that looks like a pen in that drop down menu and it adds a "signature" block.  

This solved my problem. For some reason, the signature field was reverted to a different type between two projects. I clicked each field again, clicked the pen icon to indicate it was a signature field and it worked. ¯\_(ツ)_/¯

Took me a while to figure out, but I was having the same issue.  Adobe Sign defaults to "text" entry when you place the signature field.  It was as easy as changing to a signature field by clicking in the field after you place it and selecting the fountian pen icon.  

I just went round and round with the same issue. My problem was that there was no signature panel field option on the final screen, just text, date, email, and print name. The problem that requires fixing from Adobe is that there is no signature field selection on that final page. One cannot select signature, and that snafu creates the error message that many are experiencing. This is what I did that seemed to work: First create an unnamed field on the document, by clicking on the signature block (don't name the field). Next go into advanced settings and click on the signature block to select it. It does not light up, but it just indents. Next click on save progress at the bottom of the advanced settings screen. Next go back and double click the blank field you created first. On my computer,  a separate Adobe instructions popped up on the left hand side of the unnamed field. That pop up permitted me to name the field as a signature field, so I did. The blank field then changed to a signatue field. When I sent the document after that I did not get any error message (so it apparently worked). Hope that running around in circles procedures helps someone else.  ADOBE YOU NEED TO CREATE AN AUTOMATIC SIGNATURE FIELD SELECTION FROM THE LAST PAGE  CHOICES, NOT TEXT, DATE, CHECK BOX, OR EMAIL.

I have the same question, and the answer provided does not solve the issue. I'm sending to 3 recipients, each of whom are identified as "Signer." I have assigned fields to all three signers, and all three fields are in different colors, and when the cursor hovers over the field, it indeed verifies that that field is assigned to one of the three signers. Yet I am still receiving this error message, and cannot find a way around it. What is the solution when each recipient is assigned a field, as recognized by Adobe?