We've just pushed out an update to the API Server which brings the dice engine up to date with the new Nested Inline Rolls update which rolled out today. So this permits you to create rolls which include nested inline rolls on the API Server.
In addition, we've added support for quoting whisper targets, like so:
/w "Riley D." test
Just like you can already do on the client side.
Finally, I've added some additional error logging which will hopefully help us track down the Unexpected error "s"-type bugs which are happening. If you see that error now you may get some more info alongside it -- if so please let me know here. Thanks!