: Compiling echo2_config.cc failed: (Exit 1): `error: virtual function 'createFilterFactoryFromProto' has a different return type`

[tanguofu]

ERROR: /source/BUILD:33:17: Compiling echo2_config.cc failed: (Exit 1): clang failed: error executing CppCompile command (from target //:echo2_config) /usr/lib/llvm-14/bin/clang -U_FORTIFY_SOURCE -fstack-protector -Wall -Wthread-safety -Wself-assign -Wunused-but-set-parameter -Wno-free-nonheap-object -fcolor-diagnostics -fno-omit-frame-pointer ... (remaining 191 arguments skipped)

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echo2_config.cc:17:28: error: virtual function 'createFilterFactoryFromProto' has a different return type ('Network::FilterFactoryCb' (aka 'function<void (Envoy::Network::FilterManager &)>')) than the function it overrides (which has return type 'absl::StatusOrNetwork::FilterFactoryCb' (aka 'StatusOr<function<void (Envoy::Network::FilterManager &)>>'))
Network::FilterFactoryCb createFilterFactoryFromProto(const Protobuf::Message&,

external/envoy/envoy/server/filter_config.h:177:3: note: overridden virtual function is here
createFilterFactoryFromProto(const Protobuf::Message& config,
^