Error rendering macro 'viewxls'

Steps to Replicate

1. Open Excel
2. Create a new Spreadsheet
3. Add "A" in L1C1 cell
4. Add "1" in L2C1 cell
5. Add "b" in L1C2 cell
6. Add "2" in L2C2 cell
   #Select from L1C1 to L2C2, go to Conditional Format, chose one of the shades of colors.
7. Save the Excel file
8. Add as attachment this file to the Confluence page
9. Edit the page, insert Another macro Office Excel
10. Edit the Macro and chose the attached Excel file
11. Save the page

Observed Behavior

User will be seeing the following error:

Error rendering macro 'viewxls' : com.benryan.conversion.ConversionException: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Double

Expected Behavior

User should be able to view the excel file without any issue