To Clarify:
What's your OS? Graphics card? (Windows 10, gtx 1060 6gb)
Which version of SFML are you using? Static or dynamic? If you're using a development snapshot, which revision is it? (static, latest version)
Are you showing all the relevant source code? (not sure if i need to yet)
Have you ran the debugger? What does the call stack look like? Don't know how the debugger works? Find a tutorial, seriously, this is the most important tool for a developer (Call stack looks fine)
Is it a compiler or linker error? A crash? What's the exact message? (No errors)