I'm trying to compile sounds for the Rebels in my map. First, I get this error:

12.22.08 14:11:47  tool pc 01.00.00.0609 ----------------------------------------------
12.22.08 14:11:47  reference function: _write_to_error_file
12.22.08 14:11:47  reference address: 42ca20
12.22.08 14:11:47  Couldn't read file Em02_reb0145_eng
12.22.08 14:11:47  ### failed to import: couldn't read file.

12.22.08 14:11:48  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:48  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:48  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:48  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:48  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:49  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:50  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:50  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:51  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:51  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:51  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:52  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:52  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:52  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:52  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:52  Couldn't read file Em02_reb0160_eng
12.22.08 14:11:53  ### failed to import: couldn't read file.

12.22.08 14:11:53  Couldn't read file Em02_reb0162_eng
12.22.08 14:11:54  ### failed to import: couldn't read file.

12.22.08 14:11:55  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:56  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:56  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:56  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:57  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:58  ### failed to import: sample rate must be 22050Hz or 44100Hz

12.22.08 14:11:58  ### failed to import: sample rate must be 22050Hz or 44100Hz

OK, that was odd. I changed the sample rate to 44100Hz, and tried again. I got this:

12.22.08 14:24:42  tool pc 01.00.00.0609 ----------------------------------------------
12.22.08 14:24:42  reference function: _write_to_error_file
12.22.08 14:24:42  reference address: 42ca20
12.22.08 14:24:42  Couldn't read file Em02_reb0145_eng
12.22.08 14:24:42  EAX: 0x0001800B
12.22.08 14:24:42  EBX: 0x001EE901
12.22.08 14:24:42  ECX: 0x000180F8
12.22.08 14:24:42  EDX: 0x00140608
12.22.08 14:24:42  EDI: 0x0012F5A8
12.22.08 14:24:42  ESI: 0x00000000
12.22.08 14:24:42  EBP: 0x0012F480
12.22.08 14:24:42  ESP: 0x0012F470
12.22.08 14:24:42  EIP: 0x7C90EB94, C3 8D A4 24 ?????
12.22.08 14:24:42  EXCEPTION halt in .\import_sounds.c,#935: sample_rate==_sound_sample_rate_22k

I changed the sample rate to 22050Hz, and I tried once more:

12.22.08 14:26:30  tool pc 01.00.00.0609 ----------------------------------------------
12.22.08 14:26:30  reference function: _write_to_error_file
12.22.08 14:26:30  reference address: 42ca20
12.22.08 14:26:30  Couldn't read file Em02_reb0145_eng
12.22.08 14:26:31  ### failed to import: couldn't read file.

12.22.08 14:26:37  EAX: 0x0012F805
12.22.08 14:26:37  EBX: 0x00000001
12.22.08 14:26:37  ECX: 0x6E000065
12.22.08 14:26:37  EDX: 0x0012F7E9
12.22.08 14:26:37  EDI: 0x0012F508
12.22.08 14:26:37  ESI: 0x00000000
12.22.08 14:26:37  EBP: 0x0012F3E0
12.22.08 14:26:37  ESP: 0x0012F3D0
12.22.08 14:26:37  EIP: 0x7C90EB94, C3 8D A4 24 ?????
12.22.08 14:26:37  EXCEPTION halt in \halopc\haloce\source\tag_files\tag_groups.c,#3157: #-1 is not a valid sound_permutations_block index in [#0,#32)

Google is of no help to this error, and I try not to touch HEK+ if I can, so that had nothing to do with this.
Erm... Help?

That was my guess, but there's nothing different about that particular sound.

that tags groups c#3157 is related to the scorpion in most cases, right?
you messed with the scorpion sounds?

Wrong. I figured it out. When making a sound which contains permutations (such as dialog, which was what I was doing), you MUST keep the folder under 2 MB. That folder in question was 5.76 MB, and so I tossed a bunch of stuff to bring it down, and tool only accepted it when it was 1.98 MB.
Problem solved.