Check if there is a Mismatch of Debug/Release Builds and DLLs: Lines for Linker-Input (Release):

sfml-graphics.lib
sfml-window.lib
sfml-audio.lib
sfml-network.lib
sfml-system.lib

Lines for Linker-Input (Debug):

sfml-graphics-d.lib
sfml-window-d.lib
sfml-audio-d.lib
sfml-network-d.lib
sfml-system-d.lib