protoc 2.6.1 is the latest stable version, but it won't work. It doesn't support the "proto3" language yet. You need to use an alpha release of protoc 3.0. (I don't think Ubuntu has it yet so maybe you need to compile it from source?)

Oh thay makes more sense. @skybrian

Is there a tutuorial on how to compile from the source?

Actually nevermind I figured it out. Thanks for the insight @skybrian

@AppVineyard I am having the same issue, could you please help me out as to what you did to solve the issue.

I have the same issue , have you got the solution?

Hello, we can this page to find the solution: #368 (comment)

Hi i am having the same error "Unrecognized syntax identifier "proto3". This parser only recognizes "proto2"." while doing this:
To generate the client and server side interfaces:

$ ./run_codegen.sh
Which internally invokes the protocol buffer compiler as:

$ protoc -I ../../protos --python_out=. --grpc_out=. --plugin=protoc-gen-grpc=which grpc_python_plugin ../../protos/helloworld.proto
@AppVineyard
Did anyone find the solution and can help me please?

If you want to use proto3, you will need to upgrade your protobuf software to version 3. For a Mac you can get it from here:

https://github.com/google/protobuf/releases

It may also be available through Homebrew or Linux distros.

Hi,

On the Compilation of openairinterface develop-nb-iot branch,the following errors are occurring:

The commands used after downloading the develop branch:

cd openairinterface-develop-nb-iot
source oaienv
cd cmake_targets
./build_oai -I

Error:

t/issue330/issue330.proto:1:10: Unrecognized syntax identifier "proto3". This parser only recognizes "proto2".
Makefile:2417: recipe for target 't/issue330/issue330.pb-c.h' failed
make: *** [t/issue330/issue330.pb-c.h] Error 1
make: *** Waiting for unfinished jobs....
t/issue330/issue330.proto:1:10: Unrecognized syntax identifier "proto3". This parser only recognizes "proto2".
Makefile:2417: recipe for target 't/issue330/issue330.pb-c.c' failed
make: *** [t/issue330/issue330.pb-c.c] Error 1

The errors are occuring while it is trying to compile the protobuf-c of version 2.6.1
What can be the solution?

regards,
Sravya Keerthana R

@SravyaKeerthana You will need to use protoc 3.0 or higher if you're working with .proto files that have syntax = "proto3".

Can I know how to update the protoc version from 2.6.1 to protoc 3.0 ?

You can download a protoc binary from our releases page here: https://github.com/protocolbuffers/protobuf/releases