Plugin error

[spaul13]

I just added few printf() in RenderTimingPlugin.cpp and compile it again using ndk-build which compiled and .so file generated properly. But when I put that into RenderTiming/Plugin/Android/ in RenderTiming unity asset. After generating the apk while running it, it's showing this error

DllNotFoundException: RenderTimingPlugin
E Unity : at (wrapper managed-to-native) RenderTiming:GetStartTimingFunc ()
E Unity : at RenderTiming.LateUpdate () [0x00000] in :0

Can you tell me why this is showing and how to get rid of this?