User Portlet User Portlet

Issue Solved. That has to be like this (too much reading : I mean documentation :-)): In[1]:= FacialFeatures[Import["C:/images/people.jpeg"], {"Gender","Age"}] With this you get only required columns of dataset.
**Problem solved.** That was due to the fact that ml.GetExpr was called more than once.
Thanks a lot Arnoud. That was the error. I added the args : string[] mlArgs = { "-linkmode", "launch", "-linkname", "c:/program files/wolfram research/wolfram engine/12.0/wolfram.exe"}; KernelLink ml =...