Error 91 when using Read Delimited Spreadsheet.vi

[Billy90]

Hello community, 

I want to read the voltage and current data from the txt file. However, when I import the txt file, Error 91 pops up.

The indicator in the front panel will show the data from the txt file correctly but I just can't solve the error 91. Can anyone help? 

Thank you. 

 

[altenbach]

Your error has nothing to do with reading the file, it occurs later in the "update display" case when you try to convert an empty variant into a string.