Hello team
I am working on an automation rule to see if it would work with a small sample of data. However I am running into the following error
Error:
Error Rendering smart values when executing this rule.
Missing parameter(s) for operator +u: +
# of issues for my test - 2
Purpose: get a total of story points committed at the end of the Sprint.
Attached is the Screen shot of the Automation rule.

Here's what the automation rule looks like
Line 1 : I am printing the values of the fields before using the summation formula in lines 2 and 3.
The values are as printing correctly for
Key, Summary, Story point estimate and Aggregated Story points
Line 2: I am trying to add values for Custom fields using up lookupissues - THIS IS NOT working
Line 3: I am trying to add values for Custom fields using a diff way. - That's NOT working either
Line 4: Closing braces for lookup issues.
The ideal formula would be to update the Aggregate Story points (custom field) with values from Story point estimate (for Issue 1 and Issue 2)
Aggregate Story points = issue1.Story point estimate + issue2.Story point estimate
Not sure if this is a syntax error or fundamentally wrong in the way I am trying to solve this problem.
Any help would be greatly appreciated.
Thanks
KD