Background task failure

[glanzz]

Transpilation fails when QFTGate is added in the circuit.

from qiskit import QuantumCircuit
from qiskit_ibm_transpiler.transpiler_service import TranspilerService

from qiskit.circuit.library import QFTGate


qft = QFTGate(1)


qc = QuantumCircuit(2)
qc.h(0)
qc.h(1)
qc.append(qft, [0])
qc.measure_all()

print(qc)

for j in range(1,4):
    cloud_transpiler_service = TranspilerService(
        backend_name="ibm_sherbrooke",
        ai="false",
        optimization_level=j,
    )
    transpiled_circuit = cloud_transpiler_service.run(qc)
    print(f" Passed optimization level {j}")

Output:

        ┌───┐┌─────┐ ░ ┌─┐   
   q_0: ┤ H ├┤ Qft ├─░─┤M├───
        ├───┤└─────┘ ░ └╥┘┌─┐
   q_1: ┤ H ├────────░──╫─┤M├
        └───┘        ░  ║ └╥┘
meas: 2/════════════════╩══╩═
                        0  1 
ERROR:qiskit_ibm_transpiler.wrappers.base:The request FAILED
ERROR:qiskit_ibm_transpiler.wrappers.base:Failed to get a result for transpile: The background task xxxx FAILED
ERROR:qiskit_ibm_transpiler.wrappers.base:The background task xxxx FAILED

qiskit.transpiler.exceptions.TranspilerError: 'The background task xxxx FAILED'