Aggregate operation giving error in OIC Gen3

Summary:

While using aggregate operation in OIC Gen3 getting XPath expression

Content (required):

We are reading the file. File content is in csv.

File content looks something like this

<resultset>

<result>

<debit>100</debit> ....

</result>

</resultset>

Then i am writing same content with some additional columns in another file.

I wanted to take the sum of the debit, converted it to integer and then took the sum, converted it in number and then took the sum , but nothing seems working

I guess this way used to work in OIC Gen2. Am I doing something incorrect here?

Used

Version (include the version you are using, if applicable):