what happens, if you restart the companion app?
did you upload loads of assets in the media section of your project?
Taifun
When I restarted the companion app yesterday, I got the same error.
Actually, all I have is an image, a text box, a button, and a QR Code generator extension. This also happened with some other QR Code generator extensions I was testing.
All is well today though. I just shut down the computer after about a week of hibernating. Truly, a reboot is the only thing we need most of the times. 
Thanks for your response.
When I try this program made by sir vknow360 and change the path to /storage/emulated/0 nothing happens.
I might be confused
You can no longer save a file in the root dir or an arbitrary folder of the external storage (on Android 11+). Save it in one of the Shared folders or the ASD.
See also here:
How to return QR code picture after I created the QR code？
It is in the BarCodeGenerated event. Use the filePath to get the file path in the Android storage.
Did you read the main post and the documentation? The usage is right there.
I used this method,but its image has not changed.
Please show your blocks then.
As @Anke mentioned, starting from Android 11, do not save the file in /storage/emulated/0.
B.aia (67.9 KB)
OK, thanks
Can I convert my business card into QR code?
Unfortunately, not possible with this extension.
how create a barcode?
You can get a list of supported bar formats with BarcodeFormats method.
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plese tell this informaton in read me on github
plese tell this informaton in read me on github thanks
Sure, but did it solve your issue?
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yes.thanks
Still you are looking for solution?