Mp3 to Aac conversion problem

[msaadn]

I have an Mp3 file which I was converting to aac but it gives me an error. Here is the log file.

[Error] Log
-[Information] Versions
--[NoImage] MeGUI Version : 0.3.1.1042
--[NoImage] OS : Windows Vista Ultimate Edition x86 SP2 (6.0.131072.6002)
--[NoImage] Framework used : 2.0 SP1 (2.0.50727.4016)
-[Information] Hardware
--[NoImage] CPU : Intel(R) Core(TM)2 Duo CPU     E4600  @ 2.40GHz
-[Error] Log for job1 (audio, Share The World.mp3 -> Share The World.aac)
--[Information] [6/15/2009 12:03:54 AM] Started handling job
--[Information] [6/15/2009 12:03:54 AM] Preprocessing
--[NoImage] Avisynth script
---[NoImage] NicMPG123Source("C:\Users\mSAADn\Desktop\Share The World.mp3")
---[NoImage] Normalize()
---[NoImage] 32==Audiobits(last)?ConvertAudioTo16bit(last):last
---[NoImage] return last
--[NoImage] Commandline used: - "{0}" --rawpcm {1} {3} {2} --cbr 64000
--[Information] [6/15/2009 12:03:54 AM] Encoding started
--[Information] [6/15/2009 12:03:54 AM] Encode thread started
--[Information] [6/15/2009 12:03:54 AM] Avisynth script environment opened
--[Information] [6/15/2009 12:03:57 AM] Script loaded
--[Information] Output Decoder
---[NoImage] Channels: 2
---[NoImage] Bits per sample: 16
---[NoImage] Sample rate: 11025
--[NoImage] Commandline: C:\Program Files\megui\tools\enc_aacplus\enc_aacplus.exe - "C:\Users\mSAADn\Desktop\Share The World.aac" --rawpcm 11025 2 16 --cbr 64000
--[Information] [6/15/2009 12:03:57 AM] Encoder process started
--[Error] An error occurred
---[NoImage] Exception message: Abnormal encoder termination -4
---[NoImage] Stacktrace:    at MeGUI.AviSynthAudioEncoder.encode()
---[NoImage] Inner exception: null
--[NoImage] Output from encoder via stdout
---[NoImage] ********************************************************************
---[NoImage] * AACPlus v2 Encoder (using Winamp 5.2 enc_aacplus.dll)
---[NoImage] * Source timestamp Mon May 15 17:24:26 2006
---[NoImage] * Build May 15 2006, 17:24:35
---[NoImage] ********************************************************************
---[NoImage] * NOTE!	enc_aacplus.dll must be into executable directory
---[NoImage] *	get it from Winamp 5.2 plugins directory
---[NoImage] *	tested on Winamp 5.2 Release Feb 23 2006 Full (Not Pro) version)
---[NoImage] ********************************************************************
---[NoImage] Input file: -
---[NoImage] Output file: C:\Users\mSAADn\Desktop\Share The World.aac
---[NoImage] SampleRate: 11025
---[NoImage] ChannelCount: 2
---[NoImage] BitsPerSample: 16
---[NoImage] Bitrate: 64000
---[NoImage] ChannelMode: Stereo
---[NoImage] Encoder: aacPlus v2 (HE-AAC+PS)
---[NoImage] Can't create encoder!
--[Information] [6/15/2009 12:03:58 AM] Job completed

I cant seem to figure out the problem. Can anyone help me out?