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I am trying to compile TGUI for Visual Studio 2015 because the version I was using previously seemed to not work for VS2015.  However, I keep getting this error when I try to use CMAKE:

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SFML found but version too low (requested: 2, found: 1.x.x)
CMake Error at CMakeLists.txt:290 (message):
  CMake couldn't find SFML.  Set the SFML_ROOT entry to SFML's root directory
  (containing "include" and "lib" directories).


Configuring incomplete, errors occurred!
See also "E:/Downloads/TGUI/CMakeFiles/CMakeOutput.log".

I am using SFML 2.3.2.

I recently updated my computer to windows 10, and have been getting the following error:

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Severity Code Description Project File Line
Error LNK2019 unresolved external symbol "__declspec(dllimport) public: void __thiscall tgui::CallbackManager::bindCallbackEx(class std::function<void __cdecl(struct tgui::Callback const &)>,unsigned int)" (__imp_?bindCallbackEx@CallbackManager@tgui@@QAEXV?$function@$$A6AXABUCallback@tgui@@@Z@std@@I@Z) referenced in function "public: virtual void __thiscall GuiOptions::loadWidgets(void)" (?loadWidgets@GuiOptions@@UAEXXZ) Byte E:\GameDev\C++\Byte\Byte\GuiOptions.obj 1


I've gotten unresolved external symbol errors before, but I cannot seem to figure this out.  Any help? 

Hello!  I am attempting to work with callbacks with the ComboBox.  How do I know what is selected in the box?

Hello!  I am trying to set up a GUI system.  However, my RenderWindow instance is inside of a different class than what I am trying to access it from, and I can only access it via a RenderWindow*.  Is there a way to set the tgui::Gui to the RenderWindow* that I have, or do I need to do something else?  (Sorry if this is a little noob, I'm not that awesome at C++)

Hello!  I am getting the following error when I attempt to run my program:

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The procedure entry point ?begin@String@sf@QAE?AV?$_String_iterator@V?$_String_val@U?$_Simple_types@I@std@@@std@@@std@@XZ could not be located in the dynamic link library sfml-system-2.dll.


This error occurs during runtime before a window appears.  This error only appeared after the installation of TGUI, which leads me to believe that it is the cause.  I have tried both the version of TGUI that the download includes and building it.  I am using VS2010.  Here is the .cpp file and the .hpp relevant line:

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#pragma once

#include "ResourceHolder.hpp"
#include "ResourceIdentifiers.hpp"
#include "Player.hpp"
#include "StateStack.hpp"

#include <SFML/System/Time.hpp>
#include <SFML/Graphics/RenderWindow.hpp>
#include <SFML/Graphics/Text.hpp>

#include <TGUI\TGUI.hpp>


class Application
{
private:
sf::RenderWindow mWindow;
tgui::Gui mGui;

};


and here is the complete .cpp file:

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#include "Application.hpp"
#include "Utility.hpp"
#include "State.hpp"
#include "StateIdentifiers.hpp"
#include "TitleState.hpp"
#include "GameState.hpp"
#include "MenuState.hpp"
#include "PauseState.hpp"

const sf::Time Application::timePerFrame = sf::seconds(1.f/60.f);

Application::Application()
: mWindow(sf::VideoMode(640, 480), "States", sf::Style::Close)
, mGui(mWindow)
, mTextures()
, mFonts()
, mPlayer()
, mStateStack(State::Context(mWindow, mTextures, mFonts, mPlayer))
, mStatisticsText()
, mStatisticsUpdateTime()
, mStatisticsNumFrames(0)
{
mWindow.setKeyRepeatEnabled(false);

mFonts.load(Fonts::Main, "Media/Sansation.ttf");
mTextures.load(Textures::TitleScreen, "Media/Textures/TitleScreen.png");

mStatisticsText.setFont(mFonts.get(Fonts::Main));
mStatisticsText.setPosition(5.f, 5.f);
mStatisticsText.setCharacterSize(10u);

mGui.setGlobalFont(mFonts.get(Fonts::Main));

registerStates();
mStateStack.pushState(States::Menu);
}


void Application::registerStates()
{
mStateStack.registerState<MenuState>(States::Menu);
mStateStack.registerState<GameState>(States::Game);
mStateStack.registerState<PauseState>(States::Pause);
}

void Application::run()
{
sf::Clock clock;
sf::Time timeSinceLastUpdate = sf::Time::Zero;

while (mWindow.isOpen())
{
sf::Time dt = clock.restart();
timeSinceLastUpdate += dt;
while (timeSinceLastUpdate > timePerFrame)
{
timeSinceLastUpdate -= timePerFrame;

processInput();
update(timePerFrame);

// Check inside this loop, because stack might be empty before update() call
if (mStateStack.isEmpty())
mWindow.close();
}

updateStatistics(dt);
render();
}
}

void Application::processInput()
{
sf::Event event;
while (mWindow.pollEvent(event))
{
mStateStack.handleEvent(event);
mGui.handleEvent(event);

if (event.type == sf::Event::Closed)
mWindow.close();
}
}

void Application::update(sf::Time dt)
{
mStateStack.update(dt);
}

void Application::render()
{
mWindow.clear();

mStateStack.draw();

mWindow.setView(mWindow.getDefaultView());
mWindow.draw(mStatisticsText);

mGui.draw();

mWindow.display();
}

void Application::updateStatistics(sf::Time dt)
{
mStatisticsUpdateTime += dt;
mStatisticsNumFrames += 1;
if (mStatisticsUpdateTime >= sf::seconds(1.0f))
{
mStatisticsText.setString("FPS: " + toString(mStatisticsNumFrames));

mStatisticsUpdateTime -= sf::seconds(1.0f);
mStatisticsNumFrames = 0;
}
}



Any ideas?