This is Happening because here you are mixing the non-arc Code in ARC Code,that's why this error is coming.You can use below idea of mine and it works fine , have used the same in past .
Hey You can Disable ARC
for JSON classes
by just set a flag
in under the Build Phases
of App setting
.
and the flag is
-fno-objc-arc
As Below Image depicts the Way how to do this.
It would work with charm..!!!!