"Unable to bind [] to a [Int64] property!"

What product/components do you use and which version/fix level are you on?

Software AG Api Gateway 10.7 on premise

Is your question related to the free trial, or to a production (customer) instance?

production

What are you trying to achieve? Please describe it in detail.

when I make a mashup on a get request with optional query parameters
I used
${request.query.accountId} to get the data from the native call

“Unable to bind to a [Int64] property!”
accountId is not required and optional to be sent in the request

Do you get any error messages? Please provide a full error message screenshot and log file.

Have you installed all the latest fixes for the products and systems you are using?

yes