Help please: FEEL/SCALA-01008 Error while evaluating expression

I’m learning about DMN and this is my first time using Camunda. I have an error message while executing DMN on Camunda Simulator as below. Would you anyone help me with this please?

FEEL/SCALA-01008 Error while evaluating expression: failed to parse expression ‘“Reduced by 10.78% of total product emission”’: [1.1] failure: ‘{’ expected but ‘"’ found "Reduced by 10.78% of total ^

Legacy11.dmn (45.2 KB)

I see the following error with the attached DMN.

FEEL/SCALA-01008 Error while evaluating expression: failed to evaluate expression 'ImpactsPerUnit': no variable found for name 'ImpactsPerUnit'