Failed to execute consolidate

Hi, Gurus

After upgrading applications from 9.2.0 to 11.1.2.3, the upgraded applications can't finish the consolidation process.

It just stopped at the running screen and the following errors were logged. 

<?xml version="1.0" ?>
<EStr>
    <Ref>{F06BF576-9BF5-4C4E-9AF2-2712A6C31E77}</Ref>
    <User></User>
    <DBUpdate>108986504</DBUpdate>
    <ESec>
        <Num HEX=0x800A0CC1>-2146825023</Num>
        <Description Src=>An unknown error occurred. (-2146825023)</Description>
        <Type>1</Type>
        <DTime>2013/9/26 上午 10:32:22</DTime>
        <Svr>KHBISVM02</Svr>
        <File>AccessorRTX.cpp</File>
        <Line>983</Line>
        <Ver>11.1.2.3.000.4045</Ver>
        <DStr>在所要求名稱或序數的相關集合物件中找不到此項目。(item cannot be found in the collection) </DStr>
        <ExErr></ExErr>
    </ESec>
</EStr>

We had applied the following upgrade path that mentioned in EPM Installation and Configuration Guide.