Getting UUID error while Clearance of the Invoice

I am trying to Report my Standard Invoice on stimulation Portal.

this is my Request Body.

{

“invoiceHash”: “OUb/NhccLVRyBOg17UlOLd1WKv24VPvov44m7Yv1hpk=”,

“uuid”: “5B4A9DBE5F1AB260E0630311A8C086E8”,

“invoice”: “BASE64_XML”

}

and i am getting an error like this

{

“code”: “UUID-Errors”,

“category”: “Invalid-UUID”,

“message”: “UUID format in the API body is not valid”

}

what does it mean ??? and how to solve it..

what is the correct format for UUID should be ??