Once you find the coding error that caused the Script Debugger to open, you might find it useful to look closely at the object that caused the error.

To do this, select the script that contains the error from the message stack (middle-left pane). The object that received the selected script and any temporary variables of the selected script are shown in the list of variables (upper-middle pane). The value of any selected variable at the time the error occurred is shown in the values (upper-right) pane.

Double-clicking on a variable in the list of variables opens an Inspector window on that variable.

Using the Inspector window, you can look at the internal state of the object that caused the error. An Inspector window generally lists an object's variables in the left pane and, after you select a variable from the list, the variable's value in the right pane.

Values that are nil or empty when they should have a particular value assigned to them are possible causes of the coding error. To fix the error, change your code so correct values get passed to the object.

For detailed information on using debuggers and inspectors, refer to the following: