Novice trying to resolve Error CS1001 "Identifier Expected"

I'm a complete novice trying to learn C# by making mods for a game called RimWorld. I obtained the source code of a mod that does something similar to what I'm trying to do, and have been tweaking it to see what I can make work. The following error has me stumped, as the bit of code in question is unmodified from the source code that I obtained from a working mod. I also don't know C# well enough to know what specifically Visual Studio is looking for, and copying solutions from similar questions hasn't yielded any results.

Error: CS1001 - Identifier Expected - File: GetPawnThing.cs - Line 20

using System;
using RimWorld;
using Verse;

namespace VehicleSpawnerName
{
    // Token: 0x02000002 RID: 2
    public class GetPawnThing : MoteThrown
    {
        // Token: 0x06000001 RID: 1 RVA: 0x00002050 File Offset: 0x00000250
        public override void Tick()
        {
            bool flag = base.Map == null;
            if (flag)
            {
                this.Destroy(0);
            }
            PawnKindDef Vehicle_Name = PawnKindDefOf.Vehicle_Name;
            PawnGenerationRequest pawnGenerationRequest;
            pawnGenerationRequest..ctor(Vehicle_Name, null, 2, -1, true, false, false, false, true, false, 20f, false, true, true, false, false, false, false, null, null, null, null, null, null, null, null);
            Pawn pawn = PawnGenerator.GeneratePawn(pawnGenerationRequest);
            pawn.ageTracker.AgeBiologicalTicks = 70000000L;
            GenSpawn.Spawn(pawn, base.Position, base.Map, 0);
            this.Destroy(0);
        }
    }
}

The line in question (according to the error report) is:

pawnGenerationRequest..ctor(Vehicle_Name, null, 2, -1, true, false, false, false, true, false, 20f, false, true, true, false, false, false, false, null, null, null, null, null, null, null, null);

Any help is greatly appreciated!