unable to open bpm task in uwl

Hi experts,

I am getting below error to open BPM task -

Unable to open the task xxxxxxxxxxxxx because of technical issues. Contact your system administrator for more details.

Error getting suddenly and log message is - I/O problem occurred when executing Archiving Command indexdescribe.

Please clarify dependency here- If I deployed DC on server with some changes, and tried to open old task which is in NEW status, what would be the chances to get error.

I believe there is no dependency, please correct me and advice how to fix above error.

Thanks in advance.

Ian