Error using Write to Records smart service on Interface

Hi Everyone

We're trying to write multiple records using write to record smart service on interface. But we're receiving below error --

The input "Records" must only include records from a single record type.

can anyone please let me know what is wrong with the below code?

a!writeRecords(
records: { ri!taskDetails, ri!caseDetails },
onSuccess: a!save(ri!teadOnly, false()),
onError: a!save(local!error, fv!error)
)