protk_unlock returns "ERROR: No Creo licenses are available for the startup command specified� "

 Hi All,

i am able to build protk_install_example from visual studio 15, when ever i tried to unlock application using 

"<creo_loadpoint>/<datecode>/Parametric/bin/protk_unlock.bat  < DLLs (which is created using VS 2015)>" 

using command prompt. i am getting error "No Creo licenses are available for the startup command specified"
how can i solve this error issue?