Please help! I don't exporting renders to Media Encoder CC 2015.3 but I have Media Encoder CC 2015.3
you should make sure that your AME is also 2015.3.
what exact decimal version of Ae do you have? and what's exact decimal version of AME?
it should be AE 13.8.1 and AME 10.4.0
if it is, describe your exact workflow prior to getting this message.
Retrieving data ...