Robots.txt validation problem in MSN webmaster

First my Robbots.txt is

# Alexa
User-agent: ia_archiver
Disallow:

# Ask Jeeves
User-agent: Teoma
Disallow:

# Google
User-agent: googlebot
Disallow:

# MSN
User-agent: msnbot
Disallow:

# Yahoo!
User-agent: Slurp
Disallow:

# Abacho
User-agent: AbachoBOT
Disallow:

# Baidu
User-agent: baiduspider
Disallow:

# Fireball
User-agent: fireball
Disallow:

# ObjectsSearch
User-agent: ObjectsSearch
Disallow:

# Szukacz
User-agent: szukacz
Disallow:

# Voila.fr
User-agent: VoilaBot
Disallow:

# Walhello
User-agent: Appie
Disallow:

# Yandex
User-agent: Yandex
Disallow:

# Others
User-agent: *
Disallow:

Validations Results: (at MSN webmaster tool)

Line #55: Disallow:
Error: Conflicting disallow tags found.
**************************************************
Warning: 'sitemap' - tag isn't specified.
**************************************************

Could you please help me to solve it.I am done with Canonicalization issue.So what experts here will tell me about this.is this critical to get solved.?

 

I'm guessing that msn robot found two parts affecting him, and that's why it reported conflicting disallow tags found.
The first one that is affecting msn bot is this:

# MSN
User-agent: msnbot
Disallow:

Code (markup):

the second one is this:

# Others
User-agent: *
Disallow:

Code (markup):

I'm not sure if every SE bot has this option to check disallow conflicts, but if they do... each SE bot will report this, since this last part with User-agent: * is affecting each SE bot already mentioned above. You should consider probably removing something from your robotos.txt
If it is necessary to have your robots.txt to specify different disallow rules for each bot then you should remove just that "others" section. If it is not necessary to have different rules for each bot, then you can remove everything else BUT "Others" part.
From this you pasted above, you do not have anything disallowed for any bot, so according to that you can just keep "Others" section, and remove everything else.