gpg failed to sign the data fatal: failed to write commit object [Git 2.10.0]

I followed few articles over the pretty attributes on Git 2.10 release note. Going through which upgraded the git to 2.10.0 and made changes to global .gitconfig resulting as follows -

[filter "lfs"]
    clean = git-lfs clean %f
    smudge = git-lfs smudge %f
    required = true
[user]
    name = xyz
    email = abc.def@gmail.com
    signingkey = AAAAAAA
[core]
    excludesfile = /Users/xyz/.gitignore_global
    editor = 'subl' --wait
[difftool "sourcetree"]
    cmd = opendiff \"$LOCAL\" \"$REMOTE\"
    path = 
[mergetool "sourcetree"]
    cmd = /Applications/SourceTree.app/Contents/Resources/opendiff-w.sh \"$LOCAL\" \"$REMOTE\" -ancestor \"$BASE\" -merge \"$MERGED\"
    trustExitCode = true
[alias]
    lg = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --date=relative
[color "diff"]
    old = red strike
    new = green italic

But now that I try to sign my commits using

git commit -a -S -m "message"

I get to see the following error -

You need a passphrase to unlock the secret key for

user: "XYZ (Digitally Signed) "

2048-bit RSA key, ID AAAAAAAA, created 2016-07-01

error: gpg failed to sign the data fatal: failed to write commit object

Note - I can still commit changes using git commit -a -m "message"

Is there a way to overcome the same? Or any change required in gpg configs to get along with the upgradation of git?

Update 1

Also seeking further usefulness, following Is there a way to "autosign" commits in Git with a GPG key?. I've already configured the key using

git config --global user.signingkey ED5CDE14(with my key) 
git config --global commit.gpgsign true

and quite obviously getting the same error anyway.