ADAMSync error DSID-03050740 Attribute Or Value Exists

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Hello,

I have ADAM's instance that synchronizes some attributes with my AD. The
process of synchronization finishes with the following error :

Ldap error occured. ldap_add_sW: Attribute Or Value Exists.
Extended Info: 0000217B: AtrErr: DSID-03050740, #1:
0: 0000217B: DSID-03050740, problem 1006 (ATT_OR_VALUE_EXISTS), data
0,
Att 90290 (userPrincipalName)
..


I verify that the object where the error happens does not exist in my ADAM.
Even I have tried installing the instance(authority) again.


Can someone help me?

Thanks
.