Are you finding pngmodule.dll just press download button to get your pngmodule.dll file.
If some software in your windows OS wants pngmodule.dll your operating system will ask for DLL file. When that DLL file is not available you will get this error.
If you have moved your file or changed the name of dll file you will get this error.
You will mostly see there errors when you dll file is missing:
If you need pngmodule.dll Download it right now and install it into your system to fix the error as soon as possible. just Install pngmodule.dll and fix your error.