Sonar X3 and Roland Juno Stage using Roland UM-One Midi Interface

Is there someone who can help me please? This is really urgent for me...thanks...

It depends on if you want to record the sounds from the Juno Stage, or use the Stage to trigger sounds from the included Sonar synths. If all you want is to record the sound from the Stage, then you don't even need a MIDI interface, but you do need a dedicated audio interface. Something with minimal inputs and outputs would suffice if all you're recording at one time is the keyboard. I use the Focusrite 2i2 and it works great for this purpose.

Well, then you need an audio interface, not a MIDI interface.  The MIDI interface will send the Juno Stage's MIDI data into the computer, but you need the Stage's audio sent to the computer.  There are many USB audio interfaces on the market, and you could search this forum to see what people use and recommend.  I use the Focusrite 2i2, which I believe cost around $150 USD.  There are others in this price range from Presonus as well as other manufacturers. 
 
Having said all this, I think you'll probably want to use MIDI to trigger the sounds from the included Sonar synths.  I've not heard the Juno Stage, but TruePianos, Dimension Pro, and Rapture are just 3 instruments included with X3 Producer, and they sound fantastic.  If you're dead-set on ONLY using the sounds from the Stage, then you could save some money and buy X3 Studio or Essential, which don't include all the software instruments.