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BobPBobP 

Custom flow button link url not finding Id Equals {!SAPPId.Id} (null)

I have created a flow for a service appointments and I am trying to create a custom button with the flow in the url. my link for the flow button is below. the SAPPId is the record variable in the flow for the Id but it doesnt work. I setup a similar flow for the case objwect and it works perfectly? 
/flow/Send_SMS_to_Customer?SAPPId={!ServiceAppointment.Id}retURL=/{!ServiceAppointment.Id}

When i click the button I get An unhandled fault has occurred in this flow

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SwethaSwetha (Salesforce Developers) 
HI BobP,
When you debug the flow, it should give more details on the error. Are you able to share the complete error message? Thanks