I also don't know why after working with my patch using [flashserver], by opening, reopening & opening it back again for a long time, I also got same messages "can't create flashserver object" So I have been experimenting a bit with this as well as flosc lately...
I tried to use [flashserver/flashserver 31337 1] or try [import flashserver].
However i found out that it is more to do with the port number than the actual flashserver object. Just change the port number to something like 33333 & you'll be fine. If you are using the pd-extended version, there are 2 [flashserver] externals & I just delete the one which is the older version. I still gets the message... so I either change the port number in my action script or at the pd patch. hope it helps...
you can email me if you have any question or anything you will find out while working on flashserver, as I sometimes forgets to drop by at this forum who had so many great helpful people to ask around.