The error indicates that the %Files% variable is empty, because index 0 is out of range (meaning there is no file at index 0 in the list).
You should check your Get files in folder action and maybe modify the name filter, because it seems to contain a date in the file name, as well as some index (13). Maybe there is no file like that in the directory. That's the most likely issue.
Also, your file name ends with a dot (.), which is technically impossible. You should add an extension there, or one more wildcard. So, either do '.xlsx', or '.*' at the end of the file name filter.
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