how to fix this error?

how to fix this error??

[Jan]

Is this a serious question? Look at your picture. It is too tiny to recognize any character of the error message. I admit: The very last word is "Callback". But I cannot guess the rest.

Please post the message by copy and paste as text. Don't forget to add the failing line or section of code. Give us a chance to answer.

Answer 1

[Walter Roberson]

It looks like you might be trying to use the SelectedObject property of something that is not a uibuttongroup