after putting more effort I resolved it,
actually I had to download a prover executeable file for windows OS then create folder and place the exe in it (C:\Java\CVC4) then in Eclipse
Window > Preferences > JML > JML Solver > CVC Browser button to locate the above cvc4 executeable path C:\Program Files\Java\cvc4\cvc4-1.3-win32-opt.exe After that it was working fine