In the Projectile.NewProjectile code takes the Projectile as a reference to an instance, not as a type.

[chelllovec]

(translate by Google Translate)

I decided to create a projectile that creates projectiles, but I ran into the error indicated in the name. Here is the code:

using Terraria;
using Terraria.ID;
using Terraria.ModLoader;
using Terraria.DataStructures;
using System;
using static Terraria.DataStructures.IEntitySource;
using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using RandomParashaMod.Content.Projectile;


namespace RandomParashaMod.Content.Projectile
{
// This is a basic item template.
// Please see tModLoader's ExampleMod for every other example:
// tModLoader/ExampleMod at stable · tModLoader/tModLoader
public class MultipleArrowProjectile : ModProjectile
{
// The Display Name and Tooltip of this item can be edited in the 'Localization/en-US_Mods.RandomParashaMod.hjson' file.
public override void SetStaticDefaults()
{
ProjectileID.Sets.TrailCacheLength[Projectile.type] = 5; // The length of old position to be recorded
ProjectileID.Sets.TrailingMode[Projectile.type] = 0; // The recording mode
}

public override void SetDefaults()
{
Projectile.width = 10; // The width of projectile hitbox
Projectile.height = 28; // The height of projectile hitbox
Projectile.aiStyle = ProjAIStyleID.Arrow;
Projectile.arrow = true;
Projectile.friendly = true; // Can the projectile deal damage to enemies?
Projectile.hostile = false; // Can the projectile deal damage to the player?
Projectile.DamageType = DamageClass.Ranged; // Is the projectile shoot by a ranged weapon?
Projectile.penetrate = 1; // How many monsters the projectile can penetrate. (OnTileCollide below also decrements penetrate for bounces as well)
Projectile.timeLeft = 120; // The live time for the projectile (60 = 1 second, so 600 is 10 seconds)
Projectile.alpha = 0;
Projectile.ignoreWater = false; // Does the projectile's speed be influenced by water?
Projectile.tileCollide = true; // Can the projectile collide with tiles?
}
public override void AI()
{
if (Projectile.timeLeft <= 80)
{
if (Projectile.owner == Main.myPlayer)
{
for (int i = 0; i < 2; i++)
{
float angle = 15 - 30 * i;

float radians = ((float)Math.Atan2(Projectile.velocity.Y, Projectile.velocity.X)) + MathHelper.ToRadians(angle);

float newSpeedX = (float)Math.Cos(radians) * Projectile.velocity.X;
float newSpeedY = (float)Math.Sin(radians) * Projectile.velocity.Y;

Vector2 Speed = new Vector2(newSpeedX, newSpeedY);

Projectile.NewProjectile
(Projectile.GetSource_FromThis(),
Projectile.Center,
Speed,
Projectile.type,
Projectile.originalDamage,
Projectile.knockBack,
Projectile.owner);
}
}
Projectile.Kill();
}
}
}
}

 

[Michaelsoftman]

The issue is that your namespace also contains the word 'Projectile' so VS is confused between Terraria.Projectile and RandomParashaMod.Content.Projectile. Change your namespace to 'Projectiles' or something else, and it'll work fine.

 

[chelllovec]

The issue is that your namespace also contains the word 'Projectile' so VS is confused between Terraria.Projectile and RandomParashaMod.Content.Projectile. Change your namespace to 'Projectiles' or something else, and it'll work fine.

Thank you!

 

[Glasia 森の魔王🌳]

Never name your files things like
Character
Projectile
Item
Integer
for C# to not to be confused.