Unexpected symbol `void'

Hello, I'm really new to all of this, and know next to nothing about scripting. I made a small script to play a sound on collision with an object. Take a look:

      void OnTriggerEnter (Collider other) 
          {
           if(other.gameObject.tag == "Floor")
              {
                  Audio.PlayOneShot(impact);
              }
                  
          }

I get an error, it reads: Assets/Scripts/soundplay1.cs(1,0): error CS1525: Unexpected symbol `void'

So can somebody help me...? Sorry, I'm a bit dumb when it comes to things like this.