What does this warning mean?

2016 7 21
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更新时间：2016 7 21
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It says "The rule expression is invalid. Check rule expression for completeness." I am trying to make an initial assignment, and my expression is this:
[Static Glucagon Secr] = -[p]*[[Static Glucagon Secr] - max(((o2*([Hypoglycemic Threshold] - [Plasma Glu]))/([Plasma Ins Conc]+[Basal Plasma Ins Conc]) +[Basal Glucagon Secr]),0)]
Eventually, my goal is to create sort of an "if then" situation with the model. So that if G>Gb, this expression is true, otherwise it is not. I am using initial assignments, as well as two events for this.
How can I fix this warning?

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tash7827
tash7827 2016-7-21

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Okay, I figured it out - it was just the brackets. It worked when the expression looked like this:
[Static Glucagon Secr] = -[p]*([Static Glucagon Secr] - max(((o2*([Hypoglycemic Threshold] - [Plasma Glu]))/([Plasma Ins Conc]+[Basal Plasma Ins Conc]) +[Basal Glucagon Secr]),0))

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