AP/Bur backup problem in Ericsson APG40

Burbackup failure in APG40C/4

Can anyone explain the root cause for below error during AP/Bur backup in Ericsson APG40 C/4

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AP081112187B:
Save all disk information and runtime parameter data to file \\AP081112187B\C$\acs\data\BUR\AP081112187B_20150514_230742.ddi completed
Save all disk information and runtime parameter data to file \\AP081112187A\C$\acs\data\BUR\AP081112187A_20150514_230742.ddi completed
Continuing with partition backup please wait
burBackup partition backup completed
5143 directories and 24753 files copied or equal and 0 files locked
Continuing with archive backup please wait
Error – the hashnode file on the remote node has not be created
CompareHashfiles: FAILS
AP081112187A:
burBackup partition backup completed
4640 directories and 24193 files copied or equal and 0 files locked
Continuing with archive backup please wait
burBackup execution completed