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How does the err() method tell its caller that it found an error so that its caller can change what other methods are called?

The imageImsert() method is called if the variable: valid has a value of true. Where is the error detected and does that code set valid false and there is no other code that sets valid true after it...

Where does the code use the value of the boolean to control whether or not method is called?
What method(s) calls do you want to control based on the boolean variable's value?

What method...

Use a boolean variable to remember if there has been an error generated. Initialize it to false, set it true if there is an error and use its value in an if statement to control whether to call the...