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Also should have mentioned that this same error randomly happens when clicking on a Datagrid row
Post some code!
At first glance, i can only say that something has not been initialized.
I hope you understand that in flex, you can't get away with simply declaring an object/component
The constructor is called only when the object/component is initialized.
e.g. var btn:Button
this.addChild (btn); // error-null value
var btn:Button=new Button;
this.addChild (btn); // good !
Thanks for reply,
Is the Drag Manager part of the error a red herring?
I initially focused on that because of the error being intermittent.
On further inspection, it looks like it could be a Flex event timing issue.
The application does several http calls in a certain order and if the responses do not come back in that order then such an error could occur.