Solution
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-
Name 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-
Name to be the same, as red circle below.