Help with negative exponent in computing variable?

#1
I am trying to compute a variable that has a complicated equation with a negative exponent. I've attached photos of the variable I am trying to compute, what I entered in SPSS Compute Variable, and then the error message I'm getting. Any help would be greatly appreciated!!!
 

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Dason

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#2
You have your parenthesis wrong.

You want something like: -(-13.221 + (PSS1 * 1.890) + (PSS2 * 1.002) + (PSS3 * 1.238) + (PSS4 * 2.172))

Hopefully that will bring your values into the realm of the reasonable.

Edited: Just to fill out the rest of the values and provide some additional clarity
 
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