Adobe Media Encoder CC 2017 Will Not Launch on Mac OS Sierra
When you choose Export Media from Premiere Pro CC 2017, there are options to either Queue the export request (which sends to Media Encoder, aka AME) or Export directly, which, as it says, directly exports media without going through AME.

Perhaps your Console log has some notes about what your system doesn't like about AME (or vice-versa).  On my system it launches without error (though it takes its time initializing all the bundles before it starts).