Active Directory - A constraint violation occurred. (Exception from HRESULT: 0x8007202F)

Hi,

Iam setting these attributes for an user in active directory thro  C# code 

DELIVCONTLENGTH = 2048

HOMEMDB = CN=L1,CN=First Storage Group,CN=InformationStore,CN=KOCTCPMSG03,CN=Servers,CN=Kochi,CN=Administrative Groups,CN=The Sutherland Group,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=corp,DC=suth,DC=com

MDBOVERHARDQUOTALIMIT = 51200
MDBOVERQUOTALIMIT = 49152
MSEXCHHOMESERVERNAME = /o=The XXXX Group/ou=Kochi/cn=Configuration/cn=Servers/cn=KOCTCPMSG03
SUBMISSIONCONTLENGTH = 1024


While commiting changes im getting this error: A constraint violation occurred. (Exception from HRESULT: 0x8007202F)

Why this error occurs...

Please help me in this regard..

Are you trying to add users to Active Directory. If yes then refer
http://stackoverflow.com/questions/9906067/cant-change-ad-password-from-c-sharp-code-throw-exceptions