This was a strange issue when we open a excel format report (Deski report converted to excel through scheduler) “File Error: data may have been lost.”
Then we changed our analysis and checked in the report and found there is an “####” issue in the report structure. One of the column values (SUM section) had “####” issue due to lesser width.
Increased the width of the column and scheduled the report, now its working fine without any issues. This issue was there when we try to save the report as excel in local and after increased the width of that column report working fine.