grpc.io version 1.51.3
protobuf version 4.22.0

File "/lib/python3.9/site-packages/grpc/_channel.py", line 944, in __call__
    state, call, = self._blocking(request, timeout, metadata, credentials,
  File "/lib/python3.9/site-packages/grpc/_channel.py", line 926, in 
_blocking
    call = self._channel.segregated_call(
  File "src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx.pxi", line 496, 
in grpc._cython.cygrpc.Channel.segregated_call
  File "src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx.pxi", line 366, 
in grpc._cython.cygrpc._segregated_call
  File "src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx.pxi", line 360, 
in grpc._cython.cygrpc._segregated_call
  File "src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx.pxi", line 218, 
in grpc._cython.cygrpc._call
  File "src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx.pxi", line 246, 
in grpc._cython.cygrpc._call
  File "src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx.pxi", line 89, 
in grpc._cython.cygrpc._operate
  File "src/python/grpcio/grpc/_cython/_cygrpc/tag.pyx.pxi", line 64, in 
grpc._cython.cygrpc._BatchOperationTag.prepare
  File "src/python/grpcio/grpc/_cython/_cygrpc/operation.pyx.pxi", line 37, 
in grpc._cython.cygrpc.SendInitialMetadataOperation.c
  File "src/python/grpcio/grpc/_cython/_cygrpc/metadata.pyx.pxi", line 41, 
in grpc._cython.cygrpc._store_c_metadata
ValueError: too many values to unpack (expected 2)

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