Creating new .pdf based on existing file

I have no issues when I run the code below the first time - however if the .pdf file exists when I click on "No" it says there is an error and highlights the line of code that reads
"Sheets("Doc List").ExportAsFixedFormat Type:=xlTypePDF, Filename:=fname, Quality:=xlQualityStandard, IncludeDocProperties:=True, _
IgnorePrintAreas:=False, OpenAfterPublish:=False"

Please help.

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I realized you cannot use a ":" in the hour/minute format in the filename. When I removed this - the code works.