Adding two parsed values together

Why does the following code give me an error of "invalid token +":
String a = "100";
String b = "200";
double sum = Double.parseValue(a) + Double.parseValue(b);

I am using Eclipse 3.1 --
I seems to be an eclipse debug error. If Iclick on
Double.parseDouble(a) + Double.parseDouble(b); and Iclick inspect or I try viewing the value in the Display window - I get the above error. However, when I run my code, it seems to work fine.
Thanks for everyones help -

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