in reply to Re^3: Can't call method "abs" on an undefined value.
in thread Can't call method "abs" on an undefined value.

He did change his code and did get a different error message like you described. Thanks for the help I understand the problem now.

Owl looked at him, and wondered whether to push him off the tree; but, feeling that he could always do it afterwards, he tried once more to find out what they were talking about.

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