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The [] are required. You are getting an error because False is not a value that can be inverted with !. %isRebuild% should be set to 0 (false) or a non-zero value (typically -1).
Tip: if you pause your mouse cursor over the expression a tool tip will show the expression with macros expanded.
Mega tip: if you hold down a shift key and pause your mouse cursor over and expression containing script the tool tip will show the result of evaluating the script.
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