First you should exactly know where the compiler you're using is, and where the corresponding wxWidgets' dlls are. Check in the PATH envvar if there's another compiler path in it, and make sure that you removed other compilers and added the bin path of the compiler you're using(I see It's gcc) into it.
Then everything will be fine.
Alternatively, you can manually copy libstdc++-6.dll, libgcc_s_seh-1.dll and libwinpthread-1.dll to your application's directory.