It means that you ripped an entire map, including the scorpion.
Never rip the scorpion as it causes this error.
Get new scorpion tags, there are some on the site.

still, get new scorpion tags.

It's not necessarily the scorpion. In fact, other vehicles sometimes cause this problem. It's usually the scorpion though. When getting new tags, do NOT extract them. Search scorpion on Halomaps, and download the one with a question mark for the author's name.

For future ref:
There is another thing that causes that error i think.
Something to do with a character or biped?

yes.
when you overwrite certain core files with HEK+ eg. the globals or cyborg biped, this kind of error usually occurs.

12.02.09 12:20:52  sapien pc 01.00.00.0609 ----------------------------------------------
12.02.09 12:20:52  reference function: _write_to_error_file
12.02.09 12:20:52  reference address: 401b13
12.02.09 12:20:52  Couldn't read map file './sapienbeta.map'
12.02.09 12:20:57  CreateDevice succeeded with refresh rate = 0
12.02.09 12:21:02  Sound card doesn't meet minimum hardware requirements.  Disabling hardware option. 
12.02.09 12:21:05  Increasing sound decompression buffer size to 1048576 bytes
12.02.09 12:23:37  local player 0, weapon (0x0), deleted unexpectedly
12.02.09 12:40:35  EAX: 0x19C09260
12.02.09 12:40:35  EBX: 0x00000001
12.02.09 12:40:35  ECX: 0xCC3CCC7C
12.02.09 12:40:35  EDX: 0x19BA16B8
12.02.09 12:40:35  EDI: 0x0012BD90
12.02.09 12:40:35  ESI: 0x00000000
12.02.09 12:40:35  EBP: 0x0012BC68
12.02.09 12:40:35  ESP: 0x0012BC58
12.02.09 12:40:35  EIP: 0x7C90E514, C3 8D A4 24 ?????
12.02.09 12:40:35  EXCEPTION halt in \halopc\haloce\source\tag_files\tag_groups.c,#3157: #2 is not a valid powered_mass_point_block index in [#0,#2)

Nearly the same thing happened to me except I put a "AA Wraith" on my map and Sapien crashed.

The AA wraith on the site has corrupted physics. Open it up in Guerilla, and redirect the physics to the default one in vehicles\wraith\wraith