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HI everyone Im looking for help, as you can see on attached image, is appearing that error. 


 What am i trying to do? Well, this is a personnel tracker scanning a qrcode per employee, and on the field "turno asignado", is bringing information from an excel file that is located in sharepoint library. I have tried several thing like if is blank, is empty and keep showing that error when the user opens the app. By the way the i close the error and the app keeps working.


I hope you can help how to delete that error.

Community Champion
Community Champion

Can you tell us what is in the DataCardValue14.text field? The Lookup for DataCardValue2 is dependent upon it and won't complete unless there is a valid entry.

There will be appear the ID number of each employee, this because the qr code brings an email addres, related with this email we need to bring the ID

Community Champion
Community Champion

The error shown by Power apps is indicating that DataCardValue14.Text is null - have you ensured there is some sort of value in that card, even a hardcoded value for testing? The expression won't evaluate properly until there is something.

Hi BCLS776, 


When I put a text in that label its accept it and the error dissappears. But in that label now Im bringing a text from a QRscanner. What i have done is this:


1. Set a barscanner

2. put the scanner value in a label

3. On that text input set label4.text to bring the information collected there.


Am I doing right? What else can I do to remove that error that not means change de QR scanner?

Community Champion
Community Champion

If it works, then do that 🙂


You can hide the label you are using by setting its Visible property to false. Consider putting some error checking on the DataCardValue14.text property so that it indicates if nothing has been scanned yet.

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