I have 2 DC in the org.
I done adprep /forestprep and adprep /domainprep on the DC1 server. All was successful.
When i dorepadmin /showreps /v , it showed error below:
C:\>repadmin /showreps /v
Default-First-Site-Name\MAIL1
DC Options: IS_GC
Site Options: (none)
DC object GUID: ddbfd81e-d8ed-43e4-b3e9-04dd8f65b866
DC invocationID: efe830ba-3fa8-4b18-b280-c38a6e401527
==== INBOUND NEIGHBORS ======================================
DC=pstechno,DC=com,DC=my
Default-First-Site-Name\MAIL via RPC
DC object GUID: 757cce0a-b702-446f-9dd5-02fcb352cd57
Address: 757cce0a-b702-446f-9dd5-02fcb352cd57._msdcs.pstechno.com.my
DC invocationID: 757cce0a-b702-446f-9dd5-02fcb352cd57
SYNC_ON_STARTUP DO_SCHEDULED_SYNCS WRITEABLE
USNs: 40524093/OU, 40524093/PU
Last attempt @ 2013-11-18 11:45:13 failed, result 8418 (0x20e2):
The replication operation failed because of a schema mismatch betwee
n the servers involved.
89 consecutive failure(s).
Last success @ 2013-11-14 15:48:01.
CN=Configuration,DC=pstechno,DC=com,DC=my
Default-First-Site-Name\MAIL via RPC
DC object GUID: 757cce0a-b702-446f-9dd5-02fcb352cd57
Address: 757cce0a-b702-446f-9dd5-02fcb352cd57._msdcs.pstechno.com.my
DC invocationID: 757cce0a-b702-446f-9dd5-02fcb352cd57
SYNC_ON_STARTUP DO_SCHEDULED_SYNCS WRITEABLE
USNs: 40524117/OU, 40524117/PU
Last attempt @ 2013-11-18 11:45:14 failed, result 8418 (0x20e2):
The replication operation failed because of a schema mismatch betwee
n the servers involved.
89 consecutive failure(s).
Last success @ 2013-11-14 15:48:02.
CN=Schema,CN=Configuration,DC=pstechno,DC=com,DC=my
Default-First-Site-Name\MAIL via RPC
DC object GUID: 757cce0a-b702-446f-9dd5-02fcb352cd57
Address: 757cce0a-b702-446f-9dd5-02fcb352cd57._msdcs.pstechno.com.my
DC invocationID: 757cce0a-b702-446f-9dd5-02fcb352cd57
SYNC_ON_STARTUP DO_SCHEDULED_SYNCS WRITEABLE
USNs: 40530109/OU, 40530109/PU
Last attempt @ 2013-11-18 11:45:14 was successful.
DC=DomainDnsZones,DC=pstechno,DC=com,DC=my
Default-First-Site-Name\MAIL via RPC
DC object GUID: 757cce0a-b702-446f-9dd5-02fcb352cd57
Address: 757cce0a-b702-446f-9dd5-02fcb352cd57._msdcs.pstechno.com.my
DC invocationID: 757cce0a-b702-446f-9dd5-02fcb352cd57
SYNC_ON_STARTUP DO_SCHEDULED_SYNCS WRITEABLE
USNs: 40524094/OU, 40524094/PU
Last attempt @ 2013-11-18 11:45:14 failed, result 8418 (0x20e2):
The replication operation failed because of a schema mismatch betwee
n the servers involved.
89 consecutive failure(s).
Last success @ 2013-11-14 15:48:02.
DC=ForestDnsZones,DC=pstechno,DC=com,DC=my
Default-First-Site-Name\MAIL via RPC
DC object GUID: 757cce0a-b702-446f-9dd5-02fcb352cd57
Address: 757cce0a-b702-446f-9dd5-02fcb352cd57._msdcs.pstechno.com.my
DC invocationID: 757cce0a-b702-446f-9dd5-02fcb352cd57
SYNC_ON_STARTUP DO_SCHEDULED_SYNCS WRITEABLE
USNs: 40524094/OU, 40524094/PU
Last attempt @ 2013-11-18 11:45:14 failed, result 8418 (0x20e2):
The replication operation failed because of a schema mismatch betwee
n the servers involved.
89 consecutive failure(s).
Last success @ 2013-11-14 15:48:02.
Source: Default-First-Site-Name\MAIL
******* 89 CONSECUTIVE FAILURES since 2013-11-14 15:48:02
Last error: 8418 (0x20e2):
The replication operation failed because of a schema mismatch betwee
n the servers involved.
C:\>repadmin /syncall
CALLBACK MESSAGE: The following replication is in progress:
From: 757cce0a-b702-446f-9dd5-02fcb352cd57._msdcs.pstechno.com.my
To : ddbfd81e-d8ed-43e4-b3e9-04dd8f65b866._msdcs.pstechno.com.my
CALLBACK MESSAGE: Error issuing replication: 8418 (0x20e2):
The replication operation failed because of a schema mismatch between the se
rvers involved.
From: 757cce0a-b702-446f-9dd5-02fcb352cd57._msdcs.pstechno.com.my
To : ddbfd81e-d8ed-43e4-b3e9-04dd8f65b866._msdcs.pstechno.com.my
CALLBACK MESSAGE: SyncAll Finished.
SyncAll reported the following errors:
Error issuing replication: 8418 (0x20e2):
The replication operation failed because of a schema mismatch between the se
rvers involved.
From: 757cce0a-b702-446f-9dd5-02fcb352cd57._msdcs.pstechno.com.my
To : ddbfd81e-d8ed-43e4-b3e9-04dd8f65b866._msdcs.pstechno.com.my
What could it be wrong, and how to resolve?