javaFunctionString and QuiP

while running the javaCalls example provided with QuiP I get the following error:

Error(18,2): function not implemented:

However, javaFunctionString should be a builted-in function in QuiP… why it doesn’t work?

There are two executables in the Quip distribution: Quip.exe and QuipJ.exe. The latter must be specified in your .cmd file to allow for Java calls, or in Tools>Options.