groovy - JIRA ScriptRunner Multiplying 2 CustomFieldValues error -


i trying multiply 2 customfieldvalues end following errors:

error

here code:

code

what can done resolve errors?

edit1: changed totalinstancecost calculation to: parsing

but still receive errors:

error2

change

totalinstancecost = instancestring * usagestring * 31

to

totalinstancecost = double.parsedouble(instancestring.tostring()) *                      double.parsedouble(usagestring.tostring()) * 31

-

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