Hello Can any one please tell me where I can change paths to display Device. i get this kind of errors (attached file) but i can`t find preference file where this paths stored

Thanks in Advance

It looks like you installed Houdini Display Driver for RenderMan sime time ago, using proto_install from Houdini 13. That proto_install has probably modified your $HOME/rendermn.ini and has set the dll path there.

PRMan 20.2 ships with Houdini Display Driver out of the box, so you don't need to install it with proto_install (in fact that option has been removed in H15). And you don't need to set display driver path in rendermn.ini either.