This isn't really an answer to the question. There seems to be a hangup for a form W4-T that is preventing an e-file. For me, I was also getting the same message for W4-S. Upon searching the internet, I found that W4-S is for setting up withholdings from sick pay. I can't seem to find any reference to a W4-T outside of the error described and this post.
Since W4 is supposed to be for setting up withholdings and should not be needed to file a return, I am just going to delete this form under the tools section. Would be interested in seeing a proper response to this question though.
