Filled Spread Crosshair unfixable error for me.

[Feroxiiik]

Hello, i have pretty weird problem. i am getting "unidentified external symbol" error which i CAN'T fix. First of all i will put here code of filled spread crosshair and mark you where is that error and how i am trying to fix it.

CVisuals code:

void CVisuals::SpreadCrosshair()
{
	IClientEntity *pLocal = hackManager.pLocal();
	CBaseCombatWeapon* pWeapon = (CBaseCombatWeapon*)Interfaces::EntList->GetClientEntityFromHandle(pLocal->GetActiveWeaponHandle());
	IClientEntity* WeaponEnt = Interfaces::EntList->GetClientEntityFromHandle(pLocal->GetActiveWeaponHandle());

	if (!hackManager.pLocal()->IsAlive())
		return;

	if (!GameUtils::IsBallisticWeapon(pWeapon))
		return;

	if (pWeapon == nullptr)
		return;

	int xs;
	int ys;
	Interfaces::Engine->GetScreenSize(xs, ys);
	xs /= 2; ys /= 2;

	auto accuracy = pWeapon->GetInaccuracy() * 550.f; //3000

	Render::FilledCircle((xs / 2, ys / 2, 0), 30, accuracy, Color(255, 255, 255, 255));

	if (pLocal->IsAlive())
	{
		if (pWeapon)
		{
			float inaccuracy = pWeapon->GetInaccuracy() * 1000;
			char buffer4[64];
			//sprintf_s(buffer4, "Inaccuracy:  %f", inaccuracy);
			//Render::Text(xs + accuracy + 4, ys, Color(255, 255, 255, 255), Render::Fonts::ESP, buffer4);
		}
	}
	else
	{
		//Render::Text(10, 70, Color(255, 255, 255, 255), Render::Fonts::ESP, "Inaccuracy: --");
	}

}

I need to put somewhere code of Render::FilledCircle and Textured Polygon, i put it to RenderManager.cpp:

#define M_PI 3.1415926535897
void Render::FilledCircle(Vector2D position, float points, float radius, Color color)
{
	std::vector<Vertex_t> vertices;
	float step = (float)M_PI * 2.0f / points;

	for (float a = 0; a < (M_PI * 2.0f); a += step)
		vertices.push_back(Vertex_t(Vector2D(radius * cosf(a) + position.x, radius * sinf(a) + position.y)));

	Render::TexturedPolygon((int)points, vertices.data(), color);
}

void Render::TexturedPolygon(int n, Vertex_t* vertice, Color col)
{
	static int texture_id = surface->CreateNewTextureID(true);  // Identificator "surface" isn't defined.
	static unsigned char buf[4] = { 255, 255, 255, 255 };
	surface->DrawSetTextureRGBA(texture_id, buf, 1, 1);          //Identificator "surface" isn't defined.
	surface->DrawSetColor(col);                                              //Identificator "surface" isn't defined.
	surface->DrawSetTexture(texture_id);                                //Identificator "surface" isn't defined.
    surface->DrawTexturedPolygon(n, vertice);                             //Identificator "surface" isn't defined.
}

So yes, this is my problem, i can fix it with simple code "extern ISurface* surface;" but there is next problem 2 errors: LNK2001/1120.
Can somebody please help me with this? i can't put this code anywhere without getting LNK errors. Thank you all before.

- - - Updated - - -

error fixed, but it's crashing