"Undeclared Identifier" for declared identifier

I have the following files:

Source.cpp

#include "SpriteControl.h"
#include "SFML\Graphics.hpp"
using namespace sf;
int main(int argc, char ** argv){...}

SpriteControl.cpp

#include "SpriteControl.h"
#include "SFML\Graphics.hpp"
using namespace sf;

SpriteControl::SpriteControl(){}

SpriteControl::SpriteControl(Texture textureIn){
texture = textureIn;}

SpriteControl::~SpriteControl(){}

void SpriteControl::setMoveable(bool in) {
isMoveable = in;}

void SpriteControl::setVelocity(float vx, float vy) {
if (isMoveable) {
    velocity.x = vx;
    velocity.y = vy;
    }
}

Vector2f SpriteControl::getVelocity() {
return velocity;}

SpriteControl.h

#pragma once
class SpriteControl{

    Texture texture;
    Sprite sprite;
    bool isMoveable;
    Vector2f velocity;

public:
    SpriteControl();
    SpriteControl(Texture textureIn);
    ~SpriteControl();

    Vector2f getVelocity();
    void setMoveable(bool in);
    void setVelocity(float vx, float vy);

};

When I try to build, I get undeclared identifier errors for "texture" and "velocity", as well as "overloaded member function not found" for my constructor, "left of .x must have class/struct/union", "getVelocity is not a member of SpriteControl", and so on. An error for almost every line of both the SpriteControl.cpp and SpriteControl.h files, none of which make any sense. Any thoughts?

Note: the SFML libraries have all be linked properly. Earlier, simpler versions of the program without any header files compiled and ran just fine.