hello
i try to render with maya render in dos prompt

Render -x 6000 -y 6000 -reg 0 1999 0 1999 -im pane_0 C:\Temp\distorsion7.mb

invalid flag -reg ???? !!!

and also with arnold render
C:\Users\pc>Render -r arnold -reg 50 1000 600 700 C:\Users\pc\Desktop\arn.ass

Starting "C:\Program Files\Autodesk\Maya2017\bin\mayabatch.exe"
Stack trace:

Fatal Error. Attempting to save in C:/Users/pc/AppData/Local/Temp/pc.20170816.1436.ma
// Maya exited with status -1073741819

whats wrong with maya render and arnold ? thanks in advance