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The Hunk_AllocateTempMemory error means that you don't have enough memory to run this map.
(example of the error: Hunk_AllocateTempMemory: failed on #######
To solve this open your console screen (by pressing the "~" button) and type the following code:

Note:
Don’t use more than 3/4 (75%) of your RAM memory.
Usually 256 or 512 is enough for most complex maps

When you get this error it means that your video card drivers doesn’t have OpenGL drivers installed.

Most of the time it is caused by wrong drivers for you video card.

To fix this go to your graphics card manufacturer’s website and download drivers (or install them from the manufacturer driver Disk). This commonly occurs when windows standard drivers are used.

General Sources:

ATI Drivers

NVIDIA Drivers

To solve this open your console screen (by pressing the "~" button) and type the following code:

You should see a message stating that a Registration Request was sent to the GuidAuth Master Server.
After a few seconds (perhaps up to 30 seconds) you should see a message stating that the CDKey Registration was successful.
After that, there should be no more messages about an Empty CDKey when trying to join a PB Server.

Most problems with CDKeys in Enemy Territory are caused by copying the game from one computer to another instead of installing from scratch.

more info go to punkbusters FAQ:
http://www.evenbalance.com/index.php?page=faq-et.php