Hello. I am new at Houdini and I'm in a bit of trouble trying to render anything with Mantra.

Here's what I did:

Created any sort of object, a light and a camera. Then I've added a Mantra render node and pressed render at Render > Start Render > mantra1.
The Mantra node got red stripes and there's this error message I get:

“Could not complete the rendering job:
Error: Command Exit Code: 3”

I'm running Houdini Master Ver. 9.5.170

Here's my iMac config:
MAC OSX 10.5.5
2.66 Ghz Intel Core 2 Duo
4GB 667 Mhx DDR2 SDRAM
256MB ATI Radeon HD 2600 Pro
and 91GB Free out of 300GB HD


Could someone please help me? I am going crazy with this. Am I doing something wrong here?

Thank you in advance.