Use DPM to backup Exchange DAG can not see the database

Hi，

I want to use DPM to backup Exchange DAG, but when I create the protection group, I can't open the dag to choose the database.

If somebody can tell me what's wrong with it? How to troubleshoot this problem?

The version of DPM is 2012 sp1,and the version of Exchange is 2013.

I'm sorry that I could just provide a picture in Chinese.

I received this event on the DPM Server：

Log Name:      System
Source:        Microsoft-Windows-DistributedCOM
Event ID:      10016
Description:

The application-specific permission settings do not grant Remote Launch permission for the COM Server application with CLSID {CC7D8A18-C386-48D5-9906-4FFC77A39788}  to the user DOMAIN\DC$ SID (S-1-5-21-3005733532-2211877466-3700573520-15394).
This security permission can be modified using the Component Services administrative tool.

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-DistributedCOM" Guid="{1B562E86-B7AA-4131-BADC-B6F3A001407E}" EventSourceName="DCOM" />
    <EventID Qualifiers="0">10016</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8080000000000000</Keywords>
    <TimeCreated SystemTime="2014-04-08T08:25:20.222501400Z" />
    <EventRecordID>2715</EventRecordID>
    <Correlation />
    <Execution ProcessID="856" ThreadID="2380" />
    <Channel>System</Channel>
    <Computer>DPMSERVER.domain.local</Computer>
    <Security UserID="S-1-5-21-3005733532-2211877466-3700573520-15394" />
  </System>
  <EventData>
    <Data Name="param1">application-specific</Data>
    <Data Name="param2">Remote</Data>
    <Data Name="param3">Launch</Data>
    <Data Name="param4">{CC7D8A18-C386-48D5-9906-4FFC77A39788}</Data>
    <Data Name="param5">{A3B9D3F4-2477-4F95-B2D1-F75B0FDF2A0E}</Data>
    <Data Name="param6">DOMAIN</Data>
    <Data Name="param7">DC$</Data>
    <Data Name="param8">S-1-5-21-3005733532-2211877466-3700573520-15394</Data>
    <Data Name="param9">172.16.103.3</Data>
    <Data Name="param10">Unavailable</Data>
    <Data Name="param11">Unavailable</Data>
  </EventData>
</Event>

Kindly clarify me, Thanks in advance.

thorne