Not getting request id by passing reportURI

Hi I am not able to get specific request-id by passing reportURI.

below is my uri

/jasperserver/rest_v2/reportExecutions?reportURI="/PID/Size_Details_Report"

I am getting below error

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><errorDescriptor><errorCode>generic.error.message</errorCode><errorUid>f3c1f18d-e917-4a28-bfcf-12f860c8a5c6</errorUid><message>There was an error on the server. Try again or contact site administrators. (Error UID: f3c1f18d-e917-4a28-bfcf-12f860c8a5c6)</message></errorDescriptor>

If i use only /reportExecutions, it is listing all running reports, i want specific requst id.

Please, someone, provide me the solution