The reason you get this error is the name of this cell in excel does not cohere with the string value of MS Office Parameter you specify in LabVIEW.
The principle of this API Append Report Text (str wrap).vi is to write value according to MS Office Parameter
value to position in excel where cell has the same name.
So for your case, you should modify the excel cell name
and MS Office Parameter
to be the same, as red circle below.