You want the first one (build\java\x64). .removeClass('pp-hide') }); In the case where the problem is that System.loadLibrary cannot find the DLL in question, one common misconception (reinforced by Java's error mess It could happen that the library name is also written somewhere inside the dll. e.preventDefault(); Consult the installation guide or download page for further details on how to install this component. Who Is Our Audience? /* Symptoms java.lang.UnsatisfiedLinkError: no jniopencv_core in java.library.path.