xlsx error: "Removed Records: Named range from /xl/workbook.xml part" when tried to resolve errors

I had this issue when I was using EPPlus to customise an existing template. For me the issue was in the template itself as it contained invalid references to lookup tables. I found this in Formula -> Name Manager.

I suggest that you check the template if you face this issue.

Got it resolved. I don't really know the reason. Did some research and came to know that something related to tab names can cause this issue. I had to tabs with names like 'tab' and 'tab(2)'. May be possible that xlsx treats them as same names.

In my case similar error was caused by sheet (tab) name longer than 30 characters.