Event: Source: KDC Event ID: 27

I dont know why but sometimes I get the following event in the event log on my DC, Windows Server 2003 R2 SP2 64 bit:

Event: Source: KDC Event ID: 27
While processing a TGS request for the target server krbtgt/MYDOMAIN.LOCAL, the account VISTA1$@MYDOMAIN.LOCAL did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 8). The requested etypes were 18. The accounts available etypes were 23 -133 -128 3 1.

I saw some technet guides and think that the reason could be the fact that Windows 2003 did not support encryption. I want to get rid of the error from the event logs. So can anyone tell me what can I do to solve this issue? Thanks.