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Looking at your question, it seems there are two issues: -
1. You are using FMS 3, and for DVR you need FMS 3.5
2. You need to have DVRCast application on server side or your own custom application which have neccessary handlers namely DVRSetStreamInfo and DVRGetStreamInfo defined. (DVRCast is still in pre-release and hopefully would be released soon, if you access to Adobe pre-release you can download DVRCast application from there)
Now if you want to just see DVR functionality is working, you do following steps:
1. Install FMS 3.5. (You can use Development Server if you just want give it a try or simply buy FMIS 3.5, its worth it 
)
2. Create an application named "mydvr_app" with main.asc having following simple code:
application.onConnect = function(myClient){
return true;
}
application.onPublish = function(myClient,myStream){
myStream.record( );
}
application.onUnpublish = function(myClient,myStream){
myStream.record(false);
}
3. Download FLVPlayback 2.5 from http://www.adobe.com/products/flashmediaserver/tool_downloads/. Read the documentation in it how to use it. Create a simple client using FLVPlayback 2.5.
4. Open any publisher client or simply use FMLE which you have, connect to "mydvr_app" on your FMS 3.5 and publish stream by name "mydvr_stream", if you are using FMLE 3.0 , just click on Start to publish (dont use DVR Record as it expects certain handlers to be defined on your server-side application as i mentioned earlier)
5. Open client created using FLVPlayback 2.5, give source as "rtmp://<server-ip>/mydvr_app/mydvr_stream.flv". Compile the client and run it.
Once you do all above steps, you will DVR in action
I will try to write more in detail later with respect how you can define your own server-side application if you want to use "DVR Record" of FMLE 3.0
Hope it answers your question. Please do post if something is remaining unanswered or if you wan to know more details.
well....i'm sort of a control freak...lol 
so i dont use the flvplayback component...its a hassel after alot of custom coding....i prefer to make it work like i want from what i code so i just use the video object and create my own buttons......
now doing it that way...being that i've done it before.....all i had to do was create a button that seeks to s previous time in the recording.....
lets say you want to go back 10 seconds in time while viewing a live stream you would have a button that basically does this
ns.seek( ns.time - history ); //history would be a variable that represents the 10 secs or whatever time
that would be the simplest way....just have a file recording and in the client swf....create a seek button tha
performs the above operation on click...like
seek_button.addEventListener(MouseEvent.CLICK, doSeek);
public function doSeek(event:MouseEvent):void
{
ns.seek( ns.time - 10 );
}
you dont have to touch the main.asc code or anything like that......
Hrmmm.....the simplest way is to just have a button that seeks to different time periods while its recording live......and play from there....you dont need server side scripts or all that other mess....
learn about it here....
http://www.adobe.com/devnet/flashmediaserver/articles/live_dvr_pt1_05.html
just go thru and read that 
then again...thats with FMS 3.5....lol read it anyway
well ....let me start from the beginning......you dont need to touch main.asc or even have one at all.....as for as the recorder goes....you just need it recording to a file on server....not sure about pressing all those buttons in Flash Media Encoder just make sure the stream is being recorded to file and thats it for the recording side of the equation.....i couldnt find the simple file i created a while back to give you an example but either way.....
the viewing side/client swf......you need it to connect to the same netstream string that you use in the recording swf or flash Media Encoder....if you using the flashMediaEncoder its the part that says "save to file" connect to that same folder and play that file in your player....and create the seek button and click......it will go back 10 secs......to return to current time....you would make another button that seeks to a ridiculously high number that doesnt exist so it goes to the most current time......
the error you gave leads me to believe you're not connecting to the right folder.....like you connecting to a folder that doesnt exist.....
if you want to....or if you connecting to a folder that you created in the application folder then it should be something like this
application/video/streams/myvids
thats the folder structure......but when you connect....you would connect
rtmp://localhost/video/myvids
then the play function would play
stream.play("yourvideo");
ps....you dont use the "streams" folder in your connection string when connecting but it must be there to work correctly
well i dont know where you server is located.....so i was just using an example as if your server was on your local computer....if its not then you should be connecting to the servers location......i usually write mine like so
rtmp://ipaddress/video/myvids
using the actuall IP address to the server where i put "ipaddress" .....the player and the encoder should be connecting to the same folder and playing the same file......and if you're using flashMediaEncoder..... the "FMSUrl" has to be changed to the address of the server like i wrote above....
ok.....can that what i said about the FlashMediaLive Encoder.....this is why i customize and create my own stuff......for some odd reason the save function on there points to a local drive on your/my computer.....that is lame!.....and that dvr junk at the bottom isnt working either.....this is why i dont use it...because its a hassle to learn how someone else's program that you wont care to use eventually....its too many extra steps...lol like i said...i have control issues 
you will do better to just create your own encoder.....and publishing from there.....then follow the steps like i outlined....
there is an example on how to create your own publisher.....in the flash media server documentation....i suggest use that....and set it to record so you know where the file is going.....i try to post something on process maybe later if you still need help.....but right now i'm under the gun at work ....
so i gotta get back to coding...
ok i'm back for a second......so uhhh....class is in session here is a basic example of a video encoder
use this to stream your video while recording.....what makes it record?and not live? this line here:
ns.publish("thefilename", "record");
the second parameter.....to make it stream live without recording it to file you change it to "live"....the first parameter is what you name your file...
after this you use your client player to connect to the same connection as outlined.....and to play the same file ..ie stream.play("thefilename");
package
{
import flash.display.*;
import flash.media.*;
import flash.net.*;
import flash.events.*;
public class SimpleEncoder extends Sprite
{
var nc:NetConnection;
var ns:NetStream;
var mic:Microphone;
var video:Video = new Video();
var camera:Camera;
public function SimpleEncoder():void
{
NetConnection.defaultObjectEncoding = 0;
nc = new NetConnection;
nc.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
nc.connect("rtmp://localhost/video/myvids");
}
private function publishLiveStream():void
{
ns = new NetStream(nc);
ns.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
ns.client = this;
camera = Camera.getCamera();
mic = Microphone.getMicrophone();
if (camera != null){
camera.addEventListener(ActivityEvent.ACTIVITY, activityHandler);
video = new Video();
video.attachCamera(camera);
ns.attachCamera(camera);
}
if (mic != null) {
mic.addEventListener(ActivityEvent.ACTIVITY, activityHandler);
ns.attachAudio(mic);
}
if (camera != null || mic != null)
{
// start publishing
// triggers NetStream.Publish.Start
// "thefilename" is the name of the file you use after you connect to stream in client player stream.play("thefilename");
ns.publish("thefilename", "record");
}
else
{
trace("Please check your camera and microphone");
}
addChild(video);
}
public function onBWDone():void
{
}
private function netStatusHandler(event:NetStatusEvent):void
{
trace(event.info.code);
switch (event.info.code)
{
case "NetStream.Buffer.Full":
break;
case "NetStream.Buffer.Empty":
break;
case "NetConnection.Connect.Success":
trace("Congratulations! you're connected");
publishLiveStream();
break;
case "NetConnection.Connect.Failed":
case "NetConnection.Connect.Rejected":
// trace ("Oops! the connection was rejected");
break;
case "NetStream.Play.Stop":
break;
case "NetStream.Play.StreamNotFound":
trace("The server could not find the stream you specified");
break;
case "NetStream.Publish.BadName":
break;
case "NetStream.Publish.Start":
}
}
private function statusHandler(event:StatusEvent):void {
trace("statusHandler: " + event);
trace(mic.activityLevel);
}
private function activityHandler(event:ActivityEvent):void
{
//trace(mic.activityLevel);
}
public function onFault(e:Object)
{
//trace(e.info);
//nc.close();
}
}//end class
}//end package
thelegendaryghost
you know what....i failed to ask you what was your experience level with flash .....
create a new actionscript file in in flash and paste that code there......and save the the file as SimpleEncoder.as ....(the name of the class).....then Create a new fla file...name it "test.fla" save the file in the same directory as the SimpleEncoder.as file created from the code i pasted....
ok then inside of the test.fla file....at the bottom bar where it says "Document Class"....insert SimpleEncoder with the extension part ".as".....
then ctrl+enter to preview.....or just goto the top menu and click preview.....then it should connect and show you..yourself ......i usually use my local computer first to test things out to see if it works to lessen the possibility of potential problems.....just incase.....
that code i put up there eliminates FMLE altogether.....that code is a basic encoder made with flash....so you record with that swf......
and on your client player....you connect to FMS using the same netconnection...and you play the same file in your stream player.......so the code for the client player will be similar...and instead of publishing to the stream....you'll be playing the stream.....
as far as the .fla goes.....you dont put anything inside of it....just add the actionscript...".as" file into the document class.....everything is created with code in that example....Its a little strange at first...and believe me i know...i use to code as2 myself and it took me awhile to get away from coding on the timeline .......but after coding as3 for some time now....as3 is alot better and more flexible to me.....i only use my .fla files like a compiler....and the objects i create inside the fla when i do create it.....i link it with actionscript and control it with the .as files...
and from looking at the way i told you to do it.....you dont include the ".as" when you put it in the Document Class inside the .fla i guess that update/edit junk didnt work......because i typed that up wrong.......so put SimpleEncoder without the extension on it....
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