How to use external library in ctrlExtension?

[jinwonds]

Hello,
I made example ctrlExtension project by visual studio 2015. (WinCC OA 3.16 Ver)
And I confirmed that the dll file created through the sample project worked succeed.
But when I linked external library(.lib) and used the external function through .lib in xxxExternHdl class,
WinCC OA occured error log like below. (And I also used CTRL_EXTENSION macro.)

"XXX.dll is not compatible with the current library version 316000 of WinCC OA.
It might be from version <= 3.6, or a needed external library could not be loaded."

Please let me know how to use external library.

[gschijndel]

That error is also shown when the external library cannot be found.