using BCVTB with matlab gives error loadlibrary

I am trying one of the example made for matlab co-simulation but cant seem to run it with the following error:-

Error using loadlibrary (line 422) There was an error loading the library "bcvtb" The specified module could not be found.

Error in establishClientSocket (line 22) loadlibrary(BCVTBLIB, @bcvtb);

Error in simulateAndExit (line 39) sockfd = establishClientSocket('socket.cfg');

Caused by: Error using loaddefinedlibrary The specified module could not be found. What could be wrong? how to make the library available for matlab.