API error code 15 when create an expense with attachment

API error code 15 when create an expense with attachment

Hi,
when I try to create an expense with an attachment API "https://books.zoho.com/api/v3/expenses" returns this error:

error:Response HTTP Status Code : 400 Response HTTP Body : {"code":15,"message":"Please ensure that receipt has less than 100 characters."}


where am I doing wrong ?

Thank you in advance Best regards